Unable to change the icon of the app with mine

I am new to this forum and in using the MIT App Inventor. I gave it a try and it looks great. Now I tried to change the default icon with mine but the inventor was unable to build my project app with the following message:

App Inventor is unable to compile this project.
The compiler error output was
________Preparing application icon

Is there any other way of changing the icon or if there is a recommended icon size and type (.ico, .png, etc) ?

Thank you

Got it done by using Android generated ico_launcher

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