Failed assertion: line 853 pos 14: 'file != null': is not true.

[HamadBangash353]

======== Exception caught by widgets library =======================================================
The following assertion was thrown building HomePage(dirty, state: _HomePageState#6848e):
'package:flutter/src/painting/image_provider.dart': Failed assertion: line 853 pos 14: 'file != null': is not true.

Either 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

The relevant error-causing widget was:
HomePage file:///C:/Users/WOL-91%20Hamad/AndroidStudioProjects/ImageEditorPro/example/lib/main.dart:12:12
When the exception was thrown, this was the stack:
#2 new FileImage (package:flutter/src/painting/image_provider.dart:853:14)
#3 new Image.file (package:flutter/src/widgets/image.dart:470:68)
#4 _HomePageState.build (package:image_editor_pro_example/main.dart:49:28)
#5 StatefulElement.build (package:flutter/src/widgets/framework.dart:4612:27)
#6 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4495:15)
...

======== Exception caught by widgets library =======================================================
'package:flutter/src/painting/image_provider.dart': Failed assertion: line 853 pos 14: 'file != null': is not true.
The relevant error-causing widget was:
HomePage file:///C:/Users/WOL-91%20Hamad/AndroidStudioProjects/ImageEditorPro/example/lib/main.dart:12:12

======== Exception caught by widgets library =======================================================
The following assertion was thrown building HomePage(dirty, state: _HomePageState#6848e):
'package:flutter/src/painting/image_provider.dart': Failed assertion: line 853 pos 14: 'file != null': is not true.

Either 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

The relevant error-causing widget was:
HomePage file:///C:/Users/WOL-91%20Hamad/AndroidStudioProjects/ImageEditorPro/example/lib/main.dart:12:12
When the exception was thrown, this was the stack:
#2 new FileImage (package:flutter/src/painting/image_provider.dart:853:14)
#3 new Image.file (package:flutter/src/widgets/image.dart:470:68)
#4 _HomePageState.build (package:image_editor_pro_example/main.dart:49:28)
#5 StatefulElement.build (package:flutter/src/widgets/framework.dart:4612:27)
#6 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4495:15)

RUN YOUR GITHUB CODE AND IT IS GIVING THIS ERROR.

[dernoun]

@HamadBangash353
replace this
Image.file(_image).toCenter()
by this
_image == null ? Container() : Image.file(_image).toCenter()