我正在使用 google plus share sdk 发布到 google plus。但它给了我以下链接器错误：
Undefined symbols for architecture armv7:
"_kGTMOAuth2WebViewFailed", referenced from:
-[GTMOAuth2ViewControllerTouch webView:didFailLoadWithError:] in GTMOAuth2ViewControllerTouch.o
"_kGTMOAuth2WebViewKey", referenced from:
-[GTMOAuth2ViewControllerTouch notifyWithName:webView:kind:] in GTMOAuth2ViewControllerTouch.o
"_kGTMHTTPFetcherStatusDomain", referenced from:
-[GTLService objectFetcher:finishedWithData:error:] in GTLService.o
-[GTMHTTPFetcher connection:didReceiveData:] in GTMHTTPFetcher.o
-[GTMHTTPFetcher connectionDidFinishLoading:] in GTMHTTPFetcher.o
-[GTMHTTPFetcher isRetryError:] in GTMHTTPFetcher.o
-[GTMHTTPFetcher shouldRetryNowForStatus:error:] in GTMHTTPFetcher.o
-[GTMOAuth2Authentication beginTokenFetchWithDelegate:didFinishSelector:] in GTMOAuth2Authentication.o
-[GTMOAuth2SignIn handleCallbackReached] in GTMOAuth2SignIn.o
...
"_kGTMHTTPFetcherErrorChallengeKey", referenced from:
-[GTMHTTPFetcher connection:didReceiveAuthenticationChallenge:] in GTMHTTPFetcher.o
"_kGTMOAuth2FetchTypeUserInfo", referenced from:
-[GTMOAuth2SignIn fetchGoogleUserInfo] in GTMOAuth2SignIn.o
"_kGTMHTTPFetcherStartedNotification", referenced from:
-[GTMHTTPFetcher beginFetchMayDelay:mayAuthorize:] in GTMHTTPFetcher.o
"_kGTMHTTPFetcherRetryDelayStoppedNotification", referenced from:
-[GTMHTTPFetcher destroyRetryTimer] in GTMHTTPFetcher.o
"_kGTMHTTPFetcherErrorDomain", referenced from:
-[GTMHTTPFetcher failToBeginFetchWithError:] in GTMHTTPFetcher.o
-[GTMHTTPFetcher backgroundFetchExpired] in GTMHTTPFetcher.o
-[GTMHTTPFetcher connection:didReceiveAuthenticationChallenge:] in GTMHTTPFetcher.o
"_kGTMOAuth2FetchTypeRefresh", referenced from:
-[GTMOAuth2Authentication beginTokenFetchWithDelegate:didFinishSelector:] in GTMOAuth2Authentication.o
"_kGTMOAuth2RefreshTokenChanged", referenced from:
-[GTMOAuth2Authentication setKeysForResponseDictionary:] in GTMOAuth2Authentication.o
"_kGTMOAuth2UserSignedIn", referenced from:
-[GTMOAuth2SignIn handleCallbackReached] in GTMOAuth2SignIn.o
"_kGTMOAuth2FetchTypeToken", referenced from:
请帮我。
提前谢谢。