The repository 'http://ppa.launchpad.net/versable/ is a supplementary PPA for older versions of elementary OS (Luna, as stated on the PPA's page). However, when your system tries to get updates from this PPA, it can't find release files for your OS version there. Possible solutions:
remove this supplementary (obsolete?) PPA from your system list:
Probably be the mirror from your packages, I usually setup to the us servers.
Just go to /etc/apt
Once you are here just open the file source.list, No the one that it's source.list.d
Or you can do it via terminal, using any text editor:
sudo nano /etc/apt/source.list
sudo atom /etc/apt/source.list
Now you will see all the apt link that ...