Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_EntityImage", referenced from:
objc-class-ref in JSONParser.o
"_OBJC_CLASS_$_clsCommonEntity", referenced from:
objc-class-ref in JSONParser.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)