fatal error message

Can someone help.. every time i try to even get to the word press log in i get the following message:

Fatal error: print_r(): Cannot use output buffering in output buffering display handlers in /home3/reviewuk/public_html/funeralconsultant.uk/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 253

any ideas would be gratefully received thanks in advance