The front store works fine.

But when i go to the admin page , i got :
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0 DB_ERROR_NOT_CONNECTED
in:
[select * from vo_project_version WHERE project_version_key = 'Zen-Cart Database' ]
If you were entering information, press the BACK button in your browser and re-check the information you had entered to be sure you left no blank fields.
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I move all the files from my another site in the same account .
That website works fine. Both of them use the same user name. but different database . that user name has privilege to access to both of the database.

I promise all the files in /admin/includes/configure.php are correct.

I've try many methods . But all failure.
What's happened at earth?
any suggestion will be highly appreicated.

Thanks.