The error (in the comments when you view the page source) says that your user table doesn't have a username column, and it should. If you don't know what that means or why that is, you probably need to get someone who does to help you (maybe contact your host).
If all else fails you could try restoring a backup, if you have one, but you probably want to understand what's going on before doing that. Did you make any changes?
thanks for your replay but the main problem that i don't have abackup
08-31-2011, 04:32 PM
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