Variable has incomplete type 'class LIBIL2CPP_CODEGEN_API' while integrating unity app with xcode 10.2,Variable has incomplete type 'class LIBIL2CPP_CODEGEN_API' while integrating unity with XCode 10.2

Trying to add Unity app with XCode 10.2 ,while building the project getting above error

same here i am havning the same issue

os/c-api/il2cpp-config-platforms.h’ file not found
and
Variable has incomplete type ‘class LIBIL2CPP_CODEGEN_API’