Thread:Project:Support desk/mediawiki error

hi I have a problem in mediawiki it says this error [45d6fa8e] /mw-config/?page=ExistingWiki Exception from line 181 of /home/paladox/public_html/en/includes/Hooks.php: Invalid callback in hooks for ParserFirstCallInit

Backtrace:

I am running mediawiki 1.23 wmf8 and php 5.3.8
 * 1) 0 /home/paladox/public_html/en/includes/GlobalFunctions.php(4031): Hooks::run(string, array)
 * 2) 1 /home/paladox/public_html/en/includes/parser/Parser.php(275): wfRunHooks(string, array)
 * 3) 2 /home/paladox/public_html/en/includes/parser/Parser.php(287): Parser->firstCallInit
 * 4) 3 /home/paladox/public_html/en/includes/parser/Parser.php(4823): Parser->clearState
 * 5) 4 /home/paladox/public_html/en/includes/parser/Parser.php(367): Parser->startParse(Title, ParserOptions, integer, boolean)
 * 6) 5 /home/paladox/public_html/en/includes/installer/Installer.php(591): Parser->parse(string, Title, ParserOptions, boolean)
 * 7) 6 /home/paladox/public_html/en/includes/installer/WebInstaller.php(668): Installer->parse(string, boolean)
 * 8) 7 /home/paladox/public_html/en/includes/installer/WebInstallerPage.php(358): WebInstaller->getInfoBox(string)
 * 9) 8 /home/paladox/public_html/en/includes/installer/WebInstallerPage.php(346): WebInstaller_ExistingWiki->showKeyForm
 * 10) 9 /home/paladox/public_html/en/includes/installer/WebInstaller.php(275): WebInstaller_ExistingWiki->execute
 * 11) 10 /home/paladox/public_html/en/mw-config/index.php(61): WebInstaller->execute(array)
 * 12) 11 /home/paladox/public_html/en/mw-config/index.php(29): wfInstallerMain
 * 13) 12 {main}