Message of DEATH, holy shi--

I looked at one of my websites and got this insane lengthy error message:

"Warning: Table './main/cache' is marked as crashed and should be repaired query: SELECT data, created, headers, expire, serialized FROM cache WHERE cid = 'variables' in .../public/includes/database.mysqli.inc on line 128

Warning: Table './main/cache' is marked as crashed and should be repaired query: UPDATE cache SET data = 'a:382:{s:13:\"theme_default\";s:3:\"sky\";s:13:\"filter_html_1\";i:1;s:18:\"node_options_forum\";a:1:{i:0;s:6:\"status\";}s:18:\"drupal_private_key\";s:64:\"...\";s:10:\"menu_masks\";a:19:{i:0;i:126;i:1;i:63;i:2;i:62;i:3;i:61;i:4;i:59;i:5;i:31;i:6;i:30;i:7;i:29;i:8;i:24;i:9;i:21;i:10;i:15;i:11;i:14;i:12;i:11;i:13;i:7;i:14;i:6;i:15;i:5;i:16;i:3;i:17;i:2;i:18;i:1;}s:12:\"install_task\";s:4:\"done\";s:13:\"menu_expanded\";a:1:{i:0;s:13:\"primary-links\";}s:9:\"site_name\";s:22:\"...\";s:9:\"site_mail\";s:25:\"...\";s:21:\"date_default_timezone\";i:0;s:23:\"user_email_verification\";b:1;s:9:\"clean_url\";s:1:\"1 in .../public/includes/database.mysqli.inc on line 128"

it goes on and on and on. Has anyone ever seen this monstrous message of death? Please HELP!

Bejii