Every time I try to build ios app it leads to this error; anyone know what is wrong?

Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_SharedCodeKotlinUnit", referenced from:
      objc-class-ref in ViewController.o
  "_OBJC_CLASS_$_SharedCodeMySharedClassSample", referenced from:
      objc-class-ref in ViewController.o
ld: symbol(s) not found for architecture arm64