Do you have an older version of this project? If so, does the same error occur or is this a new error? Also try to package for ETC1 and let me know if that works for you.
- [AnswerHub - Error wchar.h file not found][1]
- [AnswerHub - wchar.h file not found][2]
[Resolved] Can't build/package blank project for Android - Mobile - Epic Developer Community Forums
[2]: Compiling Android - fatal error : 'wchar.h' file not found - Mobile - Epic Developer Community Forums