我尝试将firebase从4.2.0版升级到5.4.1版。我在构建IOS时遇到此错误:Undefinedsymbolsforarchitecturex86_64:"_OBJC_CLASS_$_GULAppEnvironmentUtil",referencedfrom:objc-class-refinFirebaseCoreDiagnostics(FIRDiagnostics_b8d2083bbf595e32a15f4c92bf56379b.o)"_OBJC_CLASS_$_GULNetwork",referencedfrom:objc-class-refinFirebaseCoreDi

尝试在添加一些pod后编译我的项目。编译时出现以下错误'GoogleUtilities/GULAppEnvironmentUtil.h'filenotfoundPodfile.lock片段-FirebaseCore(5.1.1):-GoogleUtilities/Logger(~>5.2)-FirebaseDynamicLinks(3.0.2):-FirebaseAnalytics(~>5.1)-FirebaseInAppMessaging(0.11.0):-FirebaseAnalytics(~>5.1)-FirebaseCore(~>5.1)-FirebaseInstanceID(