MediaWiki internal error.

Original exception: [245c96ae2e8f4f215685b7c9] /index.php?title=Tutorial/TNG/Users_and_Access&diff=prev&oldid=2761 Error: Call to a member function getComponent() on null
Backtrace:
from /home/onenamen/wiki/includes/skins/Skin.php(111)
#0 /home/onenamen/wiki/includes/skins/SkinTemplate.php(274): Skin->getComponent(string)
#1 /home/onenamen/wiki/includes/skins/SkinTemplate.php(150): SkinTemplate->prepareQuickTemplate()
#2 /home/onenamen/wiki/includes/skins/SkinTemplate.php(181): SkinTemplate->generateHTML()
#3 /home/onenamen/wiki/includes/OutputPage.php(2899): SkinTemplate->outputPage()
#4 /home/onenamen/wiki/includes/MediaWiki.php(941): OutputPage->output(boolean)
#5 /home/onenamen/wiki/includes/MediaWiki.php(576): MediaWiki->main()
#6 /home/onenamen/wiki/index.php(50): MediaWiki->run()
#7 /home/onenamen/wiki/index.php(46): wfIndexMain()
#8 {main}

Exception caught inside exception handler: [245c96ae2e8f4f215685b7c9] /index.php?title=Tutorial/TNG/Users_and_Access&diff=prev&oldid=2761 Error: Call to a member function getComponent() on null
Backtrace:
from /home/onenamen/wiki/includes/skins/Skin.php(111)
#0 /home/onenamen/wiki/includes/skins/SkinTemplate.php(274): Skin->getComponent(string)
#1 /home/onenamen/wiki/includes/skins/SkinTemplate.php(150): SkinTemplate->prepareQuickTemplate()
#2 /home/onenamen/wiki/includes/skins/SkinTemplate.php(181): SkinTemplate->generateHTML()
#3 /home/onenamen/wiki/includes/OutputPage.php(2899): SkinTemplate->outputPage()
#4 /home/onenamen/wiki/includes/exception/MWExceptionRenderer.php(184): OutputPage->output()
#5 /home/onenamen/wiki/includes/exception/MWExceptionRenderer.php(103): MWExceptionRenderer::reportHTML(Error)
#6 /home/onenamen/wiki/includes/exception/MWExceptionHandler.php(132): MWExceptionRenderer::output(Error, integer)
#7 /home/onenamen/wiki/includes/exception/MWExceptionHandler.php(249): MWExceptionHandler::report(Error)
#8 /home/onenamen/wiki/includes/MediaWiki.php(598): MWExceptionHandler::handleException(Error, string)
#9 /home/onenamen/wiki/index.php(50): MediaWiki->run()
#10 /home/onenamen/wiki/index.php(46): wfIndexMain()
#11 {main}