Using API KEY in to retrieve activities from google plus is not working

[Pkxssoepb]

I'm using APIKEY to set up the transport and initialize the connection to retrieve activities from Google Plus. \[code\]HttpRequestInitializer initializer = (HttpRequestInitializer) new CommonGoogleClientRequestInitializer("GooglePlusAPIKey"); plusSvc = new Plus(new NetHttpTransport(), new GsonFactory(), initializer);\[/code\]It gives me this error: \[quote\] \[code\]CommonGoogleClientRequestInitializer\[/code\] cannot be cast to \[code\]HttpRequestInitializer\[/code\].\[/quote\]How do I fix this?