我手动导入firebase运行时出现以下错误:Undefinedsymbolsforarchitecturex86_64:"_OBJC_CLASS_$_GPBDescriptor",referencedfrom:objc-class-refinFirebaseMessaging(GtalkCore.pbobjc.o)objc-class-refinFirebaseMessaging(GtalkExtensions.pbobjc.o)"_OBJC_CLASS_$_GPBCodedOutputStream",referencedfrom:objc-class-refinFirebaseMe