I've updated pod with pod 'Google-Mobile-Ads-SDK'. But It has an error. Below is Error messages.
How can I solve this problem?
project using obj-c / Xcode 10.1
Undefined symbols for architecture arm64:
"_OBJC_CLASS_$_GULSwizzler", referenced from:
objc-class-ref in GoogleAppMeasurement(UIViewController+APMScreenClassName_b039968e9c3f580d4babe2de849196c0.o)
"_GULLogInfo", referenced from:
___44+[UIViewController(APMScreenClassName) load]_block_invoke in GoogleAppMeasurement(UIViewController+APMScreenClassName_b039968e9c3f580d4babe2de849196c0.o)
"_OBJC_CLASS_$_GULMutableDictionary", referenced from:
objc-class-ref in GoogleAppMeasurement(APMRemoteConfig_4b1017649d3190497e78835300aafd15.o)
"_GULIsLoggableLevel", referenced from:
-[APMMonitor isLoggableLevel:] in GoogleAppMeasurement(APMMonitor_f0e435bffa36a86d5a8b3fbc53db8f9e.o)
"_kGULNetworkHTTPStatusCodeUnavailable", referenced from:
-[APMMeasurement networkUploadCompletionHandlerWithResponse:error:] in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
-[APMMeasurement networkRemoteConfigFetchCompletionHandler:data:error:] in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
"_kGULNetworkHTTPStatusCodeNotModified", referenced from:
___41-[APMMeasurement requestDeferredDeepLink]_block_invoke in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
-[APMMeasurement networkRemoteConfigFetchCompletionHandler:data:error:] in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
"_OBJC_CLASS_$_GULNetwork", referenced from:
objc-class-ref in GoogleAppMeasurement(APMAnalytics_6f7223fbc9964756d6d362d06558edcb.o)
objc-class-ref in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
objc-class-ref in GoogleAppMeasurement(APMAppDelegateInterceptor_84f40dc1abfa4314784067a665f71bf9.o)
"_GULLogBasic", referenced from:
-[APMASLLogger logMessage:logTag:messageCode:withLogLevel:] in GoogleAppMeasurement(APMASLLogger_6762bf95ad2150885c13a361bba42cd7.o)
"_kGULNetworkHTTPStatusOK", referenced from:
___41-[APMMeasurement requestDeferredDeepLink]_block_invoke in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
-[APMMeasurement networkUploadCompletionHandlerWithResponse:error:] in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
-[APMMeasurement networkRemoteConfigFetchCompletionHandler:data:error:] in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
"_kGULNetworkHTTPStatusNoContent", referenced from:
___41-[APMMeasurement requestDeferredDeepLink]_block_invoke in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
-[APMMeasurement networkUploadCompletionHandlerWithResponse:error:] in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
-[APMMeasurement networkRemoteConfigFetchCompletionHandler:data:error:] in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
"_kGULNetworkHTTPStatusCodeCannotAcceptTraffic", referenced from:
-[APMMeasurement networkUploadCompletionHandlerWithResponse:error:] in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
-[APMMeasurement networkRemoteConfigFetchCompletionHandler:data:error:] in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
"_GULLogWarning", referenced from:
+[APMMeasurement sharedInstance] in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
-[APMUserDefaults objectForKey:] in GoogleAppMeasurement(APMUserDefaults_0148ca9c9c3719b3c5605ffeb29f297d.o)
-[APMUserDefaults setObject:forKey:] in GoogleAppMeasurement(APMUserDefaults_0148ca9c9c3719b3c5605ffeb29f297d.o)
-[APMUserDefaults synchronize] in GoogleAppMeasurement(APMUserDefaults_0148ca9c9c3719b3c5605ffeb29f297d.o)
___44+[UIViewController(APMScreenClassName) load]_block_invoke in GoogleAppMeasurement(UIViewController+APMScreenClassName_b039968e9c3f580d4babe2de849196c0.o)
"_GULLogError", referenced from:
+[APMAnalytics startWithAppID:origin:options:] in GoogleAppMeasurement(APMAnalytics_6f7223fbc9964756d6d362d06558edcb.o)
-[APMUserDefaults synchronize] in GoogleAppMeasurement(APMUserDefaults_0148ca9c9c3719b3c5605ffeb29f297d.o)
"_GULSetLoggerLevel", referenced from:
-[APMMonitor setDebugModeEnabled:] in GoogleAppMeasurement(APMMonitor_f0e435bffa36a86d5a8b3fbc53db8f9e.o)
"_OBJC_CLASS_$_GULAppDelegateSwizzler", referenced from:
objc-class-ref in GoogleAppMeasurement(APMAnalytics_6f7223fbc9964756d6d362d06558edcb.o)
"_kGULNetworkHTTPStatusCodeNotFound", referenced from:
-[APMMeasurement networkRemoteConfigFetchCompletionHandler:data:error:] in GoogleAppMeasurement(APMMeasurement_77d66481554a3daf14fde66dd9edd8c4.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)