Beginning this morning, my application keep complaining OAuthException exception, it was normal last night but it's not working now. Here is the exception.
Caused by: com.google.api.client.auth.oauth2.TokenResponseException: 401 Unauthorized
at com.google.api.client.auth.oauth2.TokenResponseException.from(TokenResponseException.java:105)
at com.google.api.client.auth.oauth2.TokenRequest.executeUnparsed(TokenRequest.java:287)
at com.google.api.client.auth.oauth2.TokenRequest.execute(TokenRequest.java:307)
at com.google.api.client.auth.oauth2.Credential.executeRefreshToken(Credential.java:570)
at com.google.api.client.googleapis.auth.oauth2.GoogleCredential.executeRefreshToken(GoogleCredential.java:362)
at com.google.api.client.auth.oauth2.Credential.refreshToken(Credential.java:489)
at com.google.api.ads.common.lib.auth.OAuth2Helper.callRefreshToken(OAuth2Helper.java:69)
at com.google.api.ads.common.lib.auth.OfflineCredentials.generateCredential(OfflineCredentials.java:172)
... 13 more
I tried to re-generate the token but it says the client has already be deleted, I don't know why, could you please help me with this issue. Thanks.