Back Engine Exception : Unable to Start License System

In case you see the error message

 ** Back Engine Exception : Unable to start license system - please contact QuantumWise support.

the problem is most likely solved by verifing that the /tmp directory is accessible and writeable by the user. Also, using the “mount” command, make sure that /tmp mount options do not include either of the following flags: noexec, nosuid, or nodev. To remove these flags, you have to edit and modify the /etc/fstab file as root and reboot the system (or perform a remount operation).