I am actually trying to change my app icon. After adding the icon files , I added Assets.xcassets in the Copy Bundle Resources of Build Phases.
Doing that resulted in the error,
" Showing Recent Errors Only Multiple commands produce '.../build/ios/Debug-dev-iphonesimulator/Runner.app/Assets.car':
- Target 'Runner' (project 'Runner') has compile command with input '/.../ios/Runner/Assets.xcassets'
- That command depends on command in Target 'Runner' (project 'Runner'): script phase “[CP] Copy Pods Resources”
'"