[Mediawiki-l] Error after upgrading from 1.9.3

Hello all,

After upgrading my wiki from 1.9.3 to 1.12 I receive the following error message when I try to access the site.

Internal error

Detected bug in an extension! Hook efDspHook failed to return a value; should return true to continue hook processing or false to abort.

Backtrace:

#0 /var/www/wiki/includes/SpecialPage.php(195): wfRunHooks('SpecialPage_ini...', Array) #1 /var/www/wiki/includes/SpecialPage.php(226): SpecialPage::initList() #2 /var/www/wiki/includes/SpecialPage.php(337): SpecialPage::resolveAlias('Specialpages') #3 /var/www/wiki/includes/SpecialPage.php(412): SpecialPage::getPageByAlias('Specialpages') #4 /var/www/wiki/includes/Wiki.php(193): SpecialPage::executePath(Object(Title)) #5 /var/www/wiki/includes/Wiki.php(45): MediaWiki->initializeSpecialCases(Object(Title), Object(StubObject), Object(WebRequest)) #6 /var/www/wiki/index.php(90): MediaWiki->initialize(Object(Title), Object(StubObject), Object(User), Object(WebRequest)) #7 {main} I tried commenting out all of my extensions in LocalSettings.php, but it didn't help.

Does anyone know what may be wrong?

Thanks