Mysql error because of revslider?

Hi,

Suddenly I get this error in the admin:

Fatal error: Uncaught exception ‘Exception’ with message ‘fetch – <b>MySQL server has gone away</b><br>—<br> Query: select * from wp_revslider_sliders order by id’ in /home/tsjikke/domains/tsjikke.nl/public_html/wp-content/plugins/revslider/inc_php/framework/functions.class.php:7 Stack trace: #0 /home/tsjikke/domains/tsjikke.nl/public_html/wp-content/plugins/revslider/inc_php/framework/db.class.php(22): UniteFunctionsRev::throwError(‘fetch – <b>MySQ…’, -1) #1 /home/tsjikke/domains/tsjikke.nl/public_html/wp-content/plugins/revslider/inc_php/framework/db.class.php(36): UniteDBRev->throwError(‘fetch – <b>MySQ…’) #2 /home/tsjikke/domains/tsjikke.nl/public_html/wp-content/plugins/revslider/inc_php/framework/db.class.php(124): UniteDBRev->checkForErrors(‘fetch’) #3 /home/tsjikke/domains/tsjikke.nl/public_html/wp-content/plugins/revslider/inc_php/revslider_slider.class.php(1431): UniteDBRev->fetch(‘wp_revslider_sl…’, ”, ‘id’) #4 /home/tsjikke/domains/tsjikke.nl/public_html/wp-content/plugins/revslider/inc_php/revslider_ in /home/tsjikke/domains/tsjikke.nl/public_html/wp-content/plugins/revslider/inc_php/framework/functions.class.php on line 7

The frontend still works, but I cannot enter the admin anymore

I read somewhere that I can deactiviate revslider via ftp, but I also read on the same place that reactiving caused the same problem.