Thread:Project:Support desk/Fatal error ParserCache.php after upgrade from 1.16 to .1.17

I have upgraded MW from 1.16 into 1.17 and after I have got such a message on mainpage: Fatal error: Call to undefined method User::optionsHash in /includes/parser/ParserCache.php on line 186 When I acces directly to the pages it works fine but on the main page i can find this message. What is wrong ? 212.14.11.13 08:47, 21 October 2011 (UTC)