Phorum Database Error

Sorry, a Phorum database error occurred.
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Error:

Failed to connect to the database.

Backtrace:

Function phorum_database_error called at
{path to Phorum}/include/db/mysql/mysqli_replication.php:163
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Function phorum_db_interact called at
{path to Phorum}/include/db/mysql.php:366
----
Function phorum_db_load_settings called at
{path to Phorum}/common.php:165
----
Function include_once called at
{path to Phorum}/read.php:21
----