[Plugin: WP Super Cache] super cache breaks after 1.1 update

i just updated supercache to 1.1
i had the prev version which worked fine with mod_rewrite caching
but i had to hack the update on comment to work for my blog as it is in subdirectory, the hack was succesfull and i posted it in the support question for the specific feature of supercache

however when i saw the update i decided to update to latest version which the author said that had these issues also fixed.

when i updated and tried to setup mod_rewrite caching (which worked perfectly previously) i get the following PHP error

Fatal error: Call to undefined function apply_filters() in public_html/blog/wp-content/plugins/wp-super-cache/wp-cache-phase1.php on line 628

some help would be great on this,
thanx,
Nikos

http://wordpress.org/extend/plugins/wp-super-cache/