hi there,
in phpmyadmin, locate your database. then use the 'search' tab and enter the searchword 'rokcommon'. make sure to select all database tables to search in.
you'll get a result in jos_extensions. click the browse button.
then you'll see results for rokcommon, one is the library, the other one is the plugin.
select the plugin using the checkbox and click the edit icon.
you'll then see a list with settings. one of those is 'enabled' = 1.
you need to change that from 1 to 0 and then save. this will disable rokcommon plugin and you should have access to your site again. an update for roksprocket will be out really soon.
of course make sure to backup your database first.
i will attach screenshots here in a few, just preparing them now.
kat