Hi apologies for the late response .Most of the were on holiday .
Please check these points to resolve this :
1. Make sure envato market plugin is deactivated in your site ,if not then please deactivate it using ftp .
refer this link to do that :
http://vibethemes.com/deactivate-plugin-without-accessing-wp-adm/
2. Second thing is to make sure that your wplms theme and all its plugins were updated successfully to latest versions.
If your site is live then please contact your webhost and ask them to restore the site from back up .
Please share your site url, admin credentials and a valid ftp credentials .We will try updating your site .
PS : mark reply as private while sharing .
Please also share your server php error log .(contact webhost to find it) (upload it somewhere online and share its link here in private reply .)