Fehlermeldung in Drupal Site

Hallo! Kann hier jemand mit meiner Fehlermeldung etwas anfangen und mir helfen?

* user warning: Got error 12 from storage engine query: SELECT data, created, headers, expire FROM cache_menu WHERE cid = '1:de' in /home/15828/domains/studienfreund.net/html/includes/database.mysql.inc on line 172.
* user warning: Got error 12 from storage engine query: UPDATE cache_menu SET data = 'a:4:{s:10:\"path index\";a:262:{s:24:\"admin/content/aggregator\";s:2:\"69\";s:33:\"admin/content/aggregator/add/feed\";i:-2;s:37:\"admin/content/aggregator/add/category\";i:-3;s:31:\"admin/content/aggregator/remove\";i:-4;s:31:\"admin/content/aggregator/update\";i:-5;s:29:\"admin/content/aggregator/list\";i:-6;s:33:\"admin/content/aggregator/settings\";i:-7;s:10:\"aggregator\";s:2:\"70\";s:18:\"aggregator/sources\";s:2:\"71\";s:21:\"aggregator/categories\";s:2:\"72\";s:14:\"aggregator/rss\";i:-11;s:15:\"aggregator/opml\";i:-12;s:17:\"admin/build/block\";s:2:\"14\";s:22:\"admin/build/block/list\";i:-14;s:27:\"admin/build/block/configure\";i:-15;s:24:\"admin/build/block/delete\";i:-16;s:21:\"admin/build/block/add\& in /home/15828/domains/sample.net/html/includes/database.mysql.inc on line 172.

Würde mich freuen, wenn mir wer hilft!