이정욱 [Jeonguk Lee - ATS]

I solved this problem by adding Run script in Extension target build phase. Copied from Runner target build phase and put it on same sequence. `/bin/sh "$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh" build`

@ShvetsovZE Here's my extension build phase run script and my OneSignal package version is 5.0.4 now. I wish it could help you. 

+1