java.lang.RuntimeException: Failure delivering result ResultInfo{who=@android:requestPermissions:, request=0, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to activity {me.vittorio_io.openhostseditor/me.vittorio_io.openhostseditor.activities.MainActivity}: java.lang.RuntimeException: Could not create file directory.
    at android.app.ActivityThread.deliverResults(ActivityThread.java:4965)
    at android.app.ActivityThread.handleSendResult(ActivityThread.java:5006)
    at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:51)
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2068)
    at android.os.Handler.dispatchMessage(Handler.java:107)
    at android.os.Looper.loop(Looper.java:224)
    at android.app.ActivityThread.main(ActivityThread.java:7551)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:995)
Caused by: java.lang.RuntimeException: Could not create file directory.
    at me.vittorio_io.openhostseditor.model.HostsManager.getBackupStorageDirectory(HostsManager.java:209)
    at me.vittorio_io.openhostseditor.model.HostsManager.saveBackup(HostsManager.java:183)
    at me.vittorio_io.openhostseditor.activities.MainActivity.onRequestPermissionsResult(MainActivity.java:273)
    at android.app.Activity.dispatchRequestPermissionsResult(Activity.java:8408)
    at android.app.Activity.dispatchActivityResult(Activity.java:8253)
    at android.app.ActivityThread.deliverResults(ActivityThread.java:4958)
    ... 11 more