This is why content management systems suck large amounts of wiener.
And you can tell it's a broken class from the error message, derp. Go to
on line 6774 and see if there's any obvious typos, or problematic code. If you can't find it, well...idk without seeing the file whether it would be safe to just comment out the use of writelog 
And you can tell it's a broken class from the error message, derp. Go to
Code:
/var/www/vhosts/typo3.ideefix.net/httpdocs/typo3_src-4.5.2/t3lib/class.t3lib_tcemain.php



