Invision Power Board Database Error

IPB WARNING [2] mysql_connect() [function.mysql-connect]: Unknown MySQL server host 'localhost' (11001) (Line: 120 of \ips_kernel\class_db_mysql.php)
Invision Power Board Database Error

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Error Returned

mySQL error: Unknown MySQL server host 'localhost' (11001) mySQL error code: Date: Saturday 30th 2020f May 2020 03:32:46 AM

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