[YouTube-API] Is developer key specific to each user?

Can some one help me..

I am a java developer.. Using YouTube client log in authentication in my app.

I registered as a developer in YouTube, i have client id & developer key. The question is, can i upload videos to different users with the same developer key which i obtained after registration? I tried for it, but getting some error

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com.google.gdata.util.AuthenticationException: Error authenticating (check service name)

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My code is 

YouTubeService service = new YouTubeService(<my_client_id>, <my_developer_key>);

service.setUserCredentials(<user1_username>, <user1_password>); (this statement changes for each user, remaining all are same)

<upload code here>

.

.

.

why am i getting this problem, whats wrong with my code?. please help me

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