Error when using COMSOL Multiphysics GUI software

Hi,
I was using COMSOL Multiphysics GUI when randomly I got this error message that related about a license issue. Anyway, I am not so sure how to handle this and so I turned to their website. I still needed to logon and give a lot of details to get the resolution of the said problem. I was in a fix so I turned to this website whose experts might provide a work around.
Anyone, please! Thanks in advance!

COMSOL Error
Could not obtain a license from COMSOL Multiphysics GUI.
License error: -96.
License server machine is down or not responding.
