I spent 2 hours searching for the answer with no luck.
I hope there is a simple answer for this.

I have joomla 1.0.15 and community builder 1.1.

I am trying to Synchronize Users.
When I click "Synchronize Users" I get this error message

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SQL errorDB function failed with error number 1062
Duplicate entry '399' for key 2 SQL=UPDATE jos_comprofiler SET `user_id`=`id`
SQL =
UPDATE jos_comprofiler SET `user_id`=`id`

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Can anyone tell me what I can do to resolve this issue?

Thank you very much.

have you disabled the Joomla default login module?