Fatal Error

To day i opened my domain and there show me setup when i try install then show:

Fatal Error in Gdn_Database.Query();
Duplicate entry '1' for key 1
update GDN_User User set
Name = :Name,
Password = :Password,
Email = :Email,
ShowEmail = :ShowEmail,
Gender = :Gender,
DateOfBirth = :DateOfBirth,
DateFirstVisit = :DateFirstVisit,
DateLastActive = :DateLastActive,
DateInserted = :DateInserted,
DateUpdated = :DateUpdated,
Admin = :Admin,
UserID = :UserID

The error occurred on or near: /home/produc/public_html/library/database/class.database.php
if (!is_object($PDOStatement)) {
trigger_error(ErrorMessage('PDO Statement failed to prepare', $this->ClassName, 'Query', $this->GetPDOErrorMessage($this->Connection()->errorInfo())), E_USER_ERROR);
} else if ($PDOStatement->execute($InputParameters) === FALSE) {
trigger_error(ErrorMessage($this->GetPDOErrorMessage($PDOStatement->errorInfo()), $this->ClassName, 'Query', $Sql), E_USER_ERROR);
}
} else {
$PDOStatement = $this->Connection()->query($Sql);
}

and more..

why that hapens?

Sorry from my bad English

luc

Your database isn't empty, and you're trying to install.

ziedinjsh

ok, but why show the install setup? in the morning forum worked, but now.. installation setup!

luc

On the basis of the information provided, it's anybody's guess.

ziedinjsh

i delete admin from database and tryed install but the show
Fatal error: Class 'CategoryModel' not found in /home/produc/public_html/applications/vanilla/settings/structure.php on line 62

Ion

Any solution for the above ? My forum also disappeared showing the install page. How to get out of this ?