Undefined symbols for architecture arm64 For DMLazyScrollView

I got this error. Please help. Thank you.

Undefined symbols for architecture arm64: "OBJC_CLASS$_DMLazyScrollView", referenced from: objc-class-ref in SACalendar.o ld: symbol(s) not found for architecture arm64 clang: error: linker command failed with exit code 1 (use -v to see invocation)