[Typo3] Typo3 is outputting error messages

[Mo Khalil]

Hi list

My website is outputting the following errors in the frontend:
Warning: Illegal offset type in
/home/yxhjardj/public_html/tslib/class.tslib_content.php on line 417
Warning: Illegal offset type in
/home/yxhjardj/public_html/tslib/class.tslib_content.php on line 417
Fatal error: Call to a member function on a non-object in
/home/yxhjardj/public_html/tslib/class.tslib_fe.php on line 2204

In the backend, when I log in as admin, the modules and footer frames are
outputting this message:
Filereference, "/home/yxhjardj/public_html/Array", not found!

I don't know how I could have caused these errors, they just appeared
overnight! The site was working fine up until then. I have template selector
and docdirconfig installed, as well as the standard typo3 extensions.

Any help would be greatly appreciated. Thanks.

mo.