Phorum Database Error

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Error:

Key 'forum_recent_messages' doesn't exist in table 'msg' (1176): SELECT msg.* FROM phorum_messages msg USE INDEX (forum_recent_messages) WHERE msg.status = 2 AND msg.forum_id = 11 AND msg.moved = 0 ORDER BY msg.datestamp DESC LIMIT 30

Backtrace:

Function interact() called at
{path to Phorum}/include/db/PhorumMysqlDB.php:164
----
Function interact() called at
{path to Phorum}/include/db/PhorumDB.php:932
----
Function get_recent_messages() called at
{path to Phorum}/include/api/feed.php:205
----
Function phorum_api_feed() called at
{path to Phorum}/feed.php:70