Regarding You tube api

Hi
I want to upload video to youtube by video_upload module.By that one i create a module in drupal.After configuring i need to give developer id,youtube user name and password.i give all these things.still in the status report one error message is shown.That is

Video Upload: YouTube Authentication Failed
The Video Upload module has the required information, but was unable to authenticate to YouTube. There may be an error in one or more of the following:

* username
* password
* developer key

Please tell me .how i solve these problem.Thanks in advance

regards,
Santhanaraj R