Hi, I too had faced this problem. You can do following to come out of this:
1. Go to control panel
2. Go to File Manager
3. Go to root of your web
4. open wp-config.php for edit
5. Comment entry related to WP-Cache:
It may look like:
define( 'WPCACHEHOME', '/hermes/bosweb/web056/b563/glo.hostingname/yourwebpage.com/wp-content/plugins/wp-super-cache/' ); //Added by WP-Cache Manager
6. Login in wp-admin page
7. Deactivate wp-super-cache or re-install