Can't build the project

[n4nachiket]

I get this error at runtime. I've added linker flags too. Please Help

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_WKUserContentController", referenced from:
      objc-class-ref in libiOSCustomBrowser.a(PUCBWebVC.o)
  "_OBJC_CLASS_$_WKWebView", referenced from:
      objc-class-ref in libiOSCustomBrowser.a(PUCBMagicRetry.o)
      objc-class-ref in libiOSCustomBrowser.a(PUCBBaseConnection.o)
      objc-class-ref in libiOSCustomBrowser.a(PUCBWebVC.o)
      objc-class-ref in libiOSCustomBrowser.a(CBWKConnection.o)
  "_OBJC_CLASS_$_WKWebViewConfiguration", referenced from:
      objc-class-ref in libiOSCustomBrowser.a(PUCBWebVC.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

[krunalbhesaniya]

same problem