Well, why not remove the plugin so the site becomes active again, and cache via the .htaccess with the following code:
PHP Code:
################ Expires Control ################
# 1 month
ExpiresActive On
ExpiresDefault A2629743
<FilesMatch "\.(gif|jpg|jpeg|png|swf)$">
# 1 month
ExpiresDefault A2629743
Header append Cache-Control "public"
</FilesMatch>
<FilesMatch "\.(xml|txt|html)$">
# 1 month
ExpiresDefault A2629743
Header append Cache-Control "proxy-revalidate"
</FilesMatch>
<FilesMatch "\.(js|css)$">
# 3 days
ExpiresDefault A259200
Header append Cache-Control "proxy-revalidate"
</FilesMatch>
#################################################