ChounHo Kim

Thanks for your answer. But I can't try right now. Cause this is my home project and I'am at working in company office. I will try as your recommended when...

I have checked. But I cannot found ios/third_party directory. Do I have to something?

I found something. I changed pod target's HEADER_SEARCH_PATHS on flutter_sequencer.podspec Then build is working. as-is: `"${PROJECT_DIR}/../../.."/ios/third_party/sfizz/src` to-be: `/usr/local/Caskroom/flutter/2.5.0/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_sequencer-0.4.2/ios/third_party/sfizz/src`