我尝试构建我的项目并收到此错误：
Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_FlurryAnalytics", referenced from:
objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)