there! I tryed

Hi there!
I tryed to Backup this site with Dropbox and get this error:

Fatal error: Undefined class constant 'ROOT_SANDBOX' in /home/micoolor/www/micool.org/wp-content/plugins/snapshot/lib/Snapshot/Model/Destination/dropbox/index.php on line 440

First i wanted to use google drive, but i didn't get it working - nothing happened when i was running the backup.

Can you give me support? Thanks.
roger