unused error

hi, when i try to change the preset color and save, an internal error was appear. here is the server error log... pls help!thanks [Mon Dec 01 10:02:24 2014] [error] [client 0000.000.0000] ModSecurity: Access denied with code 418 (phase 2). Matched phrase "message" at ARGS:drupalexp_layouts. [file "/dh/apache2/template/etc/mod_sec2/99_dreamhost_rules.conf"] [line "253"] [id "1990070"] [hostname "www.bbb.com"] [uri "/admin/appearance/settings/shoot"] [unique_id "VHytMEWjpBwAAAG1SWoAAAAQ"] [Mon Dec 01 10:25:26 2014] [error] [client 0000.000.0000]] ModSecurity: Access denied with code 418 (phase 2). Matched phrase "message" at ARGS:drupalexp_layouts. [file "/dh/apache2/template/etc/mod_sec2/99_dreamhost_rules.conf"] [line "253"] [id "1990070"] [hostname "www.bbb.com"] [uri "/admin/appearance/settings/shoot"] [unique_id "VHyylUWjpBwAAAdV0-gAAAAD"] [Mon Dec 01 10:25:26 2014] [error] [client 0000.000.0000]] File does not exist: /home/vvvv/bbb.com/favicon.ico [Mon Dec 01 12:04:17 2014] [error] [client 0000.000.0000]] ModSecurity: Access denied with code 418 (phase 2). Matched phrase "message" at ARGS:drupalexp_layouts. [file "/dh/apache2/template/etc/mod_sec2/99_dreamhost_rules.conf"] [line "253"] [id "1990070"] [hostname www.bbb.com"] [uri "/admin/appearance/settings/shoot"] [unique_id "VHzJwUWjpBwAAEqygaUAAAAB"] [Mon Dec 01 12:07:38 2014] [error] [client 0000.000.0000]] ModSecurity: Access denied with code 418 (phase 2). Matched phrase "message" at ARGS:drupalexp_layouts. [file "/dh/apache2/template/etc/mod_sec2/99_dreamhost_rules.conf"] [line "253"] [id "1990070"] [hostname "www.bbb.com"] [uri "/admin/appearance/settings/shoot"] [unique_id "VHzKiUWjpBwAAFiHjNAAAAAA"] [Mon Dec 01 12:07:46 2014] [error] [client 0000.000.0000]] ModSecurity: Access denied with code 418 (phase 2). Matched phrase "message" at ARGS:drupalexp_layouts. [file "/dh/apache2/template/etc/mod_sec2/99_dreamhost_rules.conf"] [line "253"] [id "1990070"] [hostname "www.bbb.com"] [uri "/admin/appearance/settings/shoot"] [unique_id "VHzKkUWjpBwAAFiHjNEAAAAA"]