Thread:Project:Support desk/Getting an error message when trying to access any other page besides the main page

The error that I am getting is Fatal error: Class 'SkinLGWikiTemplate' not found in /home/content/87/6292287/html/wiki/skins/LGWiki.php on line 23. I tried to change skins on my account but it gave me this error. I tried to change it back to the default skin but it won't let me. Is there anything that I can do to fix this? Thanks!