Hi,

This is very interesting codes.
I'd like to use this, but I got an error when I build it.

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:transformNativeLibsWithStripDebugSymbolForDebug'.

tried to access method com.google.common.io.Files.fileTreeTraverser()Lcom/google/common/collect/TreeTraverser; from class com.android.utils.FileUtils

lib/phone_auth.dart:147:57: Error: The method 'OTPScreen' isn't defined for the class '_PhoneLoginState'.

• '_PhoneLoginState' is from 'package:laundryapp/phone_auth.dart' ('lib/phone_auth.dart').
  Try correcting the name to the name of an existing method, or defining a method named 'OTPScreen'.
  OTPScreen(

*** First throw call stack: ( 0 CoreFoundation 0x00007fff23c4f02e __exceptionPreprocess + 350 1 libobjc.A.dylib 0x00007fff50b97b20 objc_exception_throw + 48 2 CoreFoundation 0x00007fff23c4ee6c +[NSException raise:format:] + 188 3 Runner 0x0000000104f05ce1 -[FIRPhoneAuthProvider verifyPhoneNumber:UIDelegate:completion:] + 193 4 Runner 0x0000000104ffe83d -[FLTFirebaseAuthPlugin handleMethodCall:result:] + 18109 5 Flutter 0x0000000105329b35 __45-[FlutterMethodChannel setMethodCallHandler:]_block_invoke + 104 6 Flutter 0x00000001052bd920 _ZNK7flutter21PlatformMessageRouter21HandlePlat<…> Lost connection to device.

with this message, kindly help asap, i have used your code as it is in my project, no changes.