Comments (5)
erdometo
commented on August 16, 2024
I think this problem is because of database. If you haven't created collections named "doctors" and "specialties", you got this error at the start.
when it tries to list collections etc. and if your database empty, a few values gets null value and you get this error.
We need sample db to resolve this.
from flutter_medical.
Leekogram
commented on August 16, 2024
Yeah i think @erdometo is right, please can @johnuberbacher share us the structure or image sample of this project's db
from flutter_medical.
clearnetinc
commented on August 16, 2024
I think this problem is because of database. If you haven't created collections named "doctors" and "specialties", you got this error at the start.
when it tries to list collections etc. and if your database empty, a few values gets null value and you get this error.
We need sample db to resolve this.
I had already created them. Now when i run i get the error. Sorry is been a while i had left it to work on some other project
On the device it throws a red screen with error:
NoSuchMethodError: The getter 'length' was called on null.
Receiver: null
Tried calling: length
See also: https://flutter.dev/docs/testing/errors
Debugger
Running "flutter pub get" in medmate...
Launching lib\main.dart on DRA LX5 in debug mode...
lib\main.dart
Note: C:\Flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.0\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: C:\Flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.18.0+1\android\src\main\java\io\flutter\plugins\firebase\auth\FlutterFirebaseAuthPlugin.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: C:\Flutter\.pub-cache\hosted\pub.dartlang.org\url_launcher-5.7.2\android\src\main\java\io\flutter\plugins\urllauncher\WebViewActivity.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: C:\Flutter\.pub-cache\hosted\pub.dartlang.org\cloud_firestore-0.14.0+2\android\src\main\java\io\flutter\plugins\firebase\firestore\FlutterFirebaseFirestorePlugin.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
√ Built build\app\outputs\flutter-apk\app-debug.apk.
W/ConnectionTracker(20109): Exception thrown while unbinding
W/ConnectionTracker(20109): java.lang.IllegalArgumentException: Service not registered: lu@bf5166a
W/ConnectionTracker(20109): at android.app.LoadedApk.forgetServiceDispatcher(LoadedApk.java:1556)
W/ConnectionTracker(20109): at android.app.ContextImpl.unbindService(ContextImpl.java:1642)
W/ConnectionTracker(20109): at android.content.ContextWrapper.unbindService(ContextWrapper.java:703)
W/ConnectionTracker(20109): at ci.f(:com.google.android.gms.dynamite_measurementdynamite@[email protected] (110306-0):1)
W/ConnectionTracker(20109): at ci.d(:com.google.android.gms.dynamite_measurementdynamite@[email protected] (110306-0):2)
W/ConnectionTracker(20109): at lv.E(:com.google.android.gms.dynamite_measurementdynamite@[email protected] (110306-0):9)
W/ConnectionTracker(20109): at lf.a(:com.google.android.gms.dynamite_measurementdynamite@[email protected] (110306-0):3)
W/ConnectionTracker(20109): at ef.run(:com.google.android.gms.dynamite_measurementdynamite@[email protected] (110306-0):3)
W/ConnectionTracker(20109): at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:457)
W/ConnectionTracker(20109): at java.util.concurrent.FutureTask.run(FutureTask.java:266)
W/ConnectionTracker(20109): at iy.run(:com.google.android.gms.dynamite_measurementdynamite@[email protected] (110306-0):5)
Connecting to VM Service at ws://127.0.0.1:61731/kmkpWCJ7t60=/ws
D/HWUIExtension(20109): createProgram 0x0000000800000000, binary 0x868e661f, length 10736, format 37168 within 802ns
D/HWUIExtension(20109): createProgram 0x0002000800000001, binary 0x868c1698, length 11759, format 37168 within 1150ns
I/zygote (20109): Do partial code cache collection, code=61KB, data=60KB
I/zygote (20109): After code cache collection, code=61KB, data=60KB
I/zygote (20109): Increasing code cache capacity to 256KB
W/IInputConnectionWrapper(20109): getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper(20109): getSelectedText on inactive InputConnection
W/IInputConnectionWrapper(20109): getTextAfterCursor on inactive InputConnection
I/zygote (20109): Do full code cache collection, code=125KB, data=111KB
I/zygote (20109): After code cache collection, code=102KB, data=75KB
W/IInputConnectionWrapper(20109): getSelectedText on inactive InputConnection
W/IInputConnectionWrapper(20109): getTextAfterCursor on inactive InputConnection
W/IInputConnectionWrapper(20109): beginBatchEdit on inactive InputConnection
W/IInputConnectionWrapper(20109): endBatchEdit on inactive InputConnection
W/System (20109): Ignoring header X-Firebase-Locale because its value was null.
W/System (20109): ClassLoader referenced unknown path: system/framework/mediatek-cta.jar
I/System.out(20109): e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaHttp
W/System (20109): ClassLoader referenced unknown path: system/framework/mediatek-cta.jar
I/System.out(20109): e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaHttp
W/System (20109): ClassLoader referenced unknown path: system/framework/mediatek-cta.jar
I/System.out(20109): [OkHttp] sendRequest<<
W/System (20109): Ignoring header X-Firebase-Locale because its value was null.
W/System (20109): ClassLoader referenced unknown path: system/framework/mediatek-cta.jar
I/System.out(20109): e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaHttp
W/System (20109): ClassLoader referenced unknown path: system/framework/mediatek-cta.jar
I/System.out(20109): [OkHttp] sendRequest<<
D/FirebaseAuth(20109): Notifying id token listeners about user ( 7w3C1fdALLcksKrga51nawhIlPd2 ).
D/FirebaseAuth(20109): Notifying auth state listeners about user ( 7w3C1fdALLcksKrga51nawhIlPd2 ).
I/zygote (20109): Do partial code cache collection, code=120KB, data=99KB
I/zygote (20109): After code cache collection, code=120KB, data=99KB
I/zygote (20109): Increasing code cache capacity to 512KB
W/DynamiteModule(20109): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(20109): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(20109): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
I/zygote (20109): The ClassLoaderContext is a special shared library.
I/zygote (20109): The ClassLoaderContext is a special shared library.
V/NativeCrypto(20109): Registering com/google/android/gms/org/conscrypt/NativeCrypto's 288 native methods...
I/ProviderInstaller(20109): Installed default security provider GmsCore_OpenSSL
I/zygote (20109): Background concurrent copying GC freed 15969(1104KB) AllocSpace objects, 8(352KB) LOS objects, 49% free, 2MB/4MB, paused 2.928ms total 198.541ms
W/System (20109): ClassLoader referenced unknown path: system/framework/mediatek-cta.jar
I/System.out(20109): e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaHttp
E/flutter (20109): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: NoSuchMethodError: The getter 'docs' was called on null.
E/flutter (20109): Receiver: null
E/flutter (20109): Tried calling: docs
�[38;5;244mE/flutter (20109): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)�[39;49m
�[38;5;248mE/flutter (20109): #1 _HomeScreenState.paginateDoctors�[39;49m
package:flutter_medical/routes/home.dart
�[38;5;248mE/flutter (20109): #2 _HomeScreenState.initState�[39;49m
package:flutter_medical/routes/home.dart
�[38;5;244mE/flutter (20109): #3 StatefulElement._firstBuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #4 ComponentElement.mount�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #5 Element.inflateWidget�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #6 Element.updateChild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #7 SingleChildRenderObjectElement.mount�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #8 Element.inflateWidget�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #9 Element.updateChild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #10 ComponentElement.performRebuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #11 Element.rebuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #12 ComponentElement._firstBuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #13 ComponentElement.mount�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #14 Element.inflateWidget�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #15 Element.updateChild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #16 SingleChildRenderObjectElement.mount�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #17 Element.inflateWidget�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #18 Element.updateChild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #19 SingleChildRenderObjectElement.mount�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #20 Element.inflateWidget�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #21 Element.updateChild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #22 ComponentElement.performRebuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #23 StatefulElement.performRebuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #24 Element.rebuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #25 ComponentElement._firstBuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #26 StatefulElement._firstBuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #27 ComponentElement.mount�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #28 Element.inflateWidget�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #29 Element.updateChild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #30 SingleChildRenderObjectElement.mount�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #31 Element.inflateWidget�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #32 Element.updateChild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #33 SingleChildRenderObjectElement.mount�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #34 Element.inflateWidget�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #35 Element.updateChild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #36 ComponentElement.performRebuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #37 StatefulElement.performRebuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #38 Element.rebuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #39 ComponentElement._firstBuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #40 StatefulElement._firstBuild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #41 ComponentElement.mount�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #42 Element.inflateWidget�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #43 Element.updateChild�[39;49m
package:flutter/…/widgets/framework.dart
�[38;5;244mE/flutter (20109): #44 ComponentElement.performRebuild�[39;49m
package:flutter/…/widgets/framework.dart
E/flutter (20109): #45 Element.rebuild (package:flutter/
I/flutter (20109): Shared Preferences: users name: null
I/flutter (20109): Instance of 'QuerySnapshot'
I/flutter (20109): Instance of 'QuerySnapshot'
I/flutter (20109): pulling doctors without having loaded any more, Document Limit is:
I/flutter (20109): 3
�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
�[38;5;244mThe following assertion was thrown building:�[39;49m
'package:flutter/src/painting/_network_image_io.dart': Failed assertion: line 25 pos 14: 'url != null': is not true.
�[38;5;248mEither the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
https://github.com/flutter/flutter/issues/new?template=2_bug.md
�[39;49m
�[38;5;244mWhen the exception was thrown, this was the stack�[39;49m
�[38;5;244m#2 new NetworkImage�[39;49m
package:flutter/…/painting/_network_image_io.dart
�[38;5;244m#3 new Image.network�[39;49m
package:flutter/…/widgets/image.dart
�[38;5;248m#4 _HomeScreenState.specialtyCard�[39;49m
package:flutter_medical/routes/home.dart
�[38;5;248m#5 _HomeScreenState.specialtyList.<anonymous closure>�[39;49m
package:flutter_medical/routes/home.dart
�[38;5;244m#6 SliverChildBuilderDelegate.build�[39;49m
package:flutter/…/widgets/sliver.dart
�[38;5;244m...�[39;49m
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m
I/flutter (20109): Instance of 'QuerySnapshot'
�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
'package:flutter/src/painting/_network_image_io.dart': Failed assertion: line 25 pos 14: 'url != null': is not true.
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m
�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
The getter 'length' was called on null.
Receiver: null
Tried calling: length
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m
�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
The getter 'length' was called on null.
Receiver: null
Tried calling: length
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m
�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
The getter 'length' was called on null.
Receiver: null
Tried calling: length
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m
�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
The getter 'length' was called on null.
Receiver: null
Tried calling: length
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m
�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
'package:flutter/src/painting/_network_image_io.dart': Failed assertion: line 25 pos 14: 'url != null': is not true.
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m
Reloaded 9 of 996 libraries in 23,975ms.
�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
�[38;5;244mThe following NoSuchMethodError was thrown building:�[39;49m
The getter 'length' was called on null.
Receiver: null
Tried calling: length
�[38;5;244mWhen the exception was thrown, this was the stack�[39;49m
�[38;5;244m#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)�[39;49m
�[38;5;248m#1 titleCase�[39;49m
package:flutter_medical/widgets.dart
�[38;5;248m#2 _HomeScreenState.userHeader�[39;49m
package:flutter_medical/routes/home.dart
�[38;5;248m#3 _HomeScreenState.loadUserInfo.<anonymous closure>�[39;49m
package:flutter_medical/routes/home.dart
�[38;5;244m#4 SliverChildBuilderDelegate.build�[39;49m
package:flutter/…/widgets/sliver.dart
�[38;5;244m...�[39;49m
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m
�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
The getter 'length' was called on null.
Receiver: null
Tried calling: length
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m
�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
'package:flutter/src/painting/_network_image_io.dart': Failed assertion: line 25 pos 14: 'url != null': is not true.
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m
Reloaded 9 of 996 libraries in 4,616ms.
W/System (20109): ClassLoader referenced unknown path: system/framework/mediatek-cta.jar
I/System.out(20109): e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaHttp
W/System (20109): ClassLoader referenced unknown path: system/framework/mediatek-cta.jar
I/System.out(20109): e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaHttp
�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
�[38;5;244mThe following NoSuchMethodError was thrown building:�[39;49m
The getter 'length' was called on null.
Receiver: null
Tried calling: length
�[38;5;244mWhen the exception was thrown, this was the stack�[39;49m
�[38;5;244m#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)�[39;49m
�[38;5;248m#1 titleCase�[39;49m
package:flutter_medical/widgets.dart
�[38;5;248m#2 _HomeScreenState.userHeader�[39;49m
package:flutter_medical/routes/home.dart
�[38;5;248m#3 _HomeScreenState.loadUserInfo.<anonymous closure>�[39;49m
package:flutter_medical/routes/home.dart
�[38;5;244m#4 SliverChildBuilderDelegate.build�[39;49m
package:flutter/…/widgets/sliver.dart
�[38;5;244m...�[39;49m
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m
�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
The getter 'length' was called on null.
Receiver: null
Tried calling: length
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m
�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
'package:flutter/src/painting/_network_image_io.dart': Failed assertion: line 25 pos 14: 'url != null': is not true.
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m
Reloaded 9 of 996 libraries in 3,910ms.
W/System (20109): ClassLoader referenced unknown path: system/framework/mediatek-cta.jar
I/System.out(20109): e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaHttp
W/System (20109): ClassLoader referenced unknown path: system/framework/mediatek-cta.jar
I/System.out(20109): e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaHttp
D/Surface (20109): Surface::disconnect(this=0x841eb000,api=1)
D/Surface (20109): Surface::disconnect(this=0x841eb000,api=-1)
D/Surface (20109): Surface::connect(this=0x87eff000,api=1)
I/Choreographer(20109): Skipped 36 frames! The application may be doing too much work on its main thread.
V/PhoneWindow(20109): DecorView setVisiblity: visibility = 0, Parent = ViewRoot{5376303 com.finde.medmate/com.finde.medmate.MainActivity,ident = 0}, this = DecorView@e0945bd[MainActivity]
W/ConnectionTracker(20109): Exception thrown while unbinding
W/ConnectionTracker(20109): java.lang.IllegalArgumentException: Service not registered: lu@bf5166a
W/ConnectionTracker(20109): at android.app.LoadedApk.forgetServiceDispatcher(LoadedApk.java:1556)
W/ConnectionTracker(20109): at android.app.ContextImpl.unbindService(ContextImpl.java:1642)
W/ConnectionTracker(20109): at android.content.ContextWrapper.unbindService(ContextWrapper.java:703)
W/ConnectionTracker(20109): at ci.f(:com.google.android.gms.dynamite_measurementdynamite@[email protected] (110306-0):1)
W/ConnectionTracker(20109): at ci.d(:com.google.android.gms.dynamite_measurementdynamite@[email protected] (110306-0):2)
W/ConnectionTracker(20109): at lv.E(:com.google.android.gms.dynamite_measurementdynamite@[email protected] (110306-0):9)
W/ConnectionTracker(20109): at lf.a(:com.google.android.gms.dynamite_measurementdynamite@[email protected] (110306-0):3)
W/ConnectionTracker(20109): at ef.run(:com.google.android.gms.dynamite_measurementdynamite@[email protected] (110306-0):3)
W/ConnectionTracker(20109): at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:457)
W/ConnectionTracker(20109): at java.util.concurrent.FutureTask.run(FutureTask.java:266)
W/ConnectionTracker(20109): at iy.run(:com.google.android.gms.dynamite_measurementdynamite@[email protected] (110306-0):5)
W/System (20109): ClassLoader referenced unknown path: system/framework/mediatek-cta.jar
I/System.out(20109): e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaHttp
from flutter_medical.
shmatoka
commented on August 16, 2024
I tried this today but I receive the same error like everyone here, I think this is because db structure is missing and also when start app, app try to found image which is save in the db but because our is empty coming, error with
'package:flutter/src/painting/_network_image_io.dart': Failed assertion: line 25 pos 14: 'url != null': is not true.
and another error for GlobalDrawer
NoSuchMethodError: The getter 'length' was called on null.
Receiver: null
Tried calling: length
See also: https://flutter.dev/docs/testing/errors
from flutter_medical.
clearnetinc
commented on August 16, 2024
I wonder if @johnuberbacher <https://github.com/johnuberbacher> will ever
respond
…On Fri, Jan 29, 2021 at 5:29 PM shmatoka ***@***.***> wrote:
I tried this today but I receive the same error like everyone here, I
think this is because db structure is missing and also when start app, app
try to found image which is save in the db but because our is empty coming,
error with
'package:flutter/src/painting/_network_image_io.dart': Failed assertion:
line 25 pos 14: 'url != null': is not true.
and another error for GlobalDrawer
NoSuchMethodError: The getter 'length' was called on null.
Receiver: null
Tried calling: length
See also: https://flutter.dev/docs/testing/errors
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