[TYPO3-english] Fatal error:DatabaseConnection.php on line 1294

[Siyavash]

Hello

who know what that is

Fatal error: Call to a member function fetch_object() on a non-object in /customers/f/4/7/poolaki.com/httpd.www/upload/typo3/sysext/core/Classes/Database/DatabaseConnection.php on line 1294

step 3 when installing if you username and password used for database, then comes this error.

what should I do?