MediaWiki internal error.

Original exception: [254b8b62] /index.php?title=File:Tps65950-user_guide.pdf&action=edit Exception from line 511 of /home/droid-dev/www/includes/EditPage.php:
Backtrace:
#0 /home/droid-dev/www/includes/EditPage.php(401): EditPage->displayPermissionsError()
#1 /home/droid-dev/www/includes/actions/EditAction.php(50): EditPage->edit()
#2 /home/droid-dev/www/includes/Wiki.php(428): EditAction->show()
#3 /home/droid-dev/www/includes/Wiki.php(292): MediaWiki->performAction()
#4 /home/droid-dev/www/includes/Wiki.php(588): MediaWiki->performRequest()
#5 /home/droid-dev/www/includes/Wiki.php(447): MediaWiki->main()
#6 /home/droid-dev/www/index.php(46): MediaWiki->run()
#7 {main}

Exception caught inside exception handler: [e8eb8b6f] /index.php?title=File:Tps65950-user_guide.pdf&action=edit Exception from line 222 of /home/droid-dev/www/includes/Hooks.php: Detected bug in an extension! Hook Cite::checkRefsNoReferences has invalid call signature; Parameter 2 to Cite::checkRefsNoReferences() expected to be a reference, value given
Backtrace:
#0 /home/droid-dev/www/includes/GlobalFunctions.php(4004): Hooks::run()
#1 /home/droid-dev/www/includes/parser/Parser.php(396): wfRunHooks()
#2 /home/droid-dev/www/includes/cache/MessageCache.php(1070): Parser->parse()
#3 /home/droid-dev/www/includes/Message.php(963): MessageCache->parse()
#4 /home/droid-dev/www/includes/Message.php(661): Message->parseText()
#5 /home/droid-dev/www/includes/Message.php(720): Message->toString()
#6 /home/droid-dev/www/includes/OutputPage.php(2241): Message->parse()
#7 /home/droid-dev/www/includes/exception/PermissionsError.php(55): OutputPage->showPermissionsErrorPage()
#8 /home/droid-dev/www/includes/exception/MWExceptionHandler.php(44): PermissionsError->report()
#9 /home/droid-dev/www/includes/exception/MWExceptionHandler.php(139): MWExceptionHandler::report()
#10 /home/droid-dev/www/includes/Wiki.php(454): MWExceptionHandler::handle()
#11 /home/droid-dev/www/index.php(46): MediaWiki->run()
#12 {main}