Unhandled Exception: Invalid argument(s)

[muss01]

[ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: Invalid argument(s) E/flutter (18097): #0 _StringBase.+ (dart:core-patch/string_patch.dart:260:57) E/flutter (18097): #1 ImagePickerSaver.saveFile (package:image_picker_saver/image_picker_saver.dart:85:34)

Am using the permission storage in AndroidManifest.xml

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

But the application doesn't ask me for the permission

[pasha009]

I got similar Unhandled Exception in some unrelated project. It turned out that it was because i was trying to concatenate a string and null object.
Just sharing my reason of having this error...

[nandin-borjigin]

I don't know why the repo author commented this line out.

image_picker_saver/ios/Classes/ImagePickerSaverPlugin.m

Line 129 in 19cdd80

//_result(fileName);

It causes channel.InvokeMethod on dart side to return null and concatenating a string with a null value would throw an 'Invalid arugment(s)' exception.