What is this error when I trying to change app icon in a flutter project

Question

C:\Users\Kumudu Wijewardhana\AndroidStudioProjects\testing_app\android\app\src\main\res\mipmap-hdpi\app icon.png: Resource and asset merger: ' ' is not a valid file-based resource name character: File-based resource names must contain only lowercase az, 0-9, or underscore

FAILURE: Build failed with an exception.

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

  C:\Users\Kumudu Wijewardhana\AndroidStudioProjects\testing_app\android\app\src\main\res\mipmap-hdpi\app icon.png: Error: ' ' is not a valid file-based resource name character: File-based resource names must contain only lowercase az, 0-9, or underscore

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

Answer 1

Check the name of icon.

The error is File-based resource names must contain only lowercase az, 0-9, or underscore

Lets change the name correct validate.

Answer 2

The error is talking about your app icon having a space(" ") in its name. You should change your app icon name to app_icon.png instead of app icon.png .

Do not add space(" ") to the name of your resources.