Firebase iOS Cocoapods Error

Building the CocoaPods dependency project Pods-Unity-iPhone...
+ Preparing output directory...
+ Libraries: 0 supplied, 0 built
+ Frameworks: 5 supplied, 11 built
+ Pre-parsing project files...
+ Building Pods_Unity_iPhone for iphoneos (configuration: Release)
+ [arm64] Target Support Files/Pods-Unity-iPhone/Pods-Unity-iPhone-dummy.m.obj is up to date
+ [arm64] Linking Pods_Unity_iPhone...
Undefined symbols for architecture arm64:
"_OBJC_CLASS_$_FIRApp", referenced from:
objc-class-ref in FIRAnalyticsConnector(FIRAnalyticsConnector_8094107d82c527bf23f93e98c9db96d1.o)
objc-class-ref in FirebaseAnalytics(FIRAnalytics_bb540b7bc432fd4c54bf2d7f57c43305.o)
"_OBJC_CLASS_$_FIRComponent", referenced from:
objc-class-ref in FIRAnalyticsConnector(FIRAnalyticsConnector_8094107d82c527bf23f93e98c9db96d1.o)
"_kFIRLoggerAnalytics", referenced from:
+[FIRAnalytics startWithConfiguration:options:] in FirebaseAnalytics(FIRAnalytics_bb540b7bc432fd4c54bf2d7f57c43305.o)
"_FIRInstallationIDDidChangeNotification", referenced from:
+[FIRAnalytics observeFirebaseInstallationIDChanges] in FirebaseAnalytics(FIRAnalytics_bb540b7bc432fd4c54bf2d7f57c43305.o)
"_OBJC_CLASS_$_FIROptions", referenced from:
objc-class-ref in FirebaseAnalytics(FIRAnalytics_bb540b7bc432fd4c54bf2d7f57c43305.o)
"_OBJC_CLASS_$_FIRInstallations", referenced from:
objc-class-ref in FirebaseAnalytics(FIRAnalytics_bb540b7bc432fd4c54bf2d7f57c43305.o)
ld: 6 symbol(s) not found for architecture arm64