Mike Rife
Ansys Employee

Hi Muyideen

Please ask the licensing admin at your location - there are quite a few reasons why a license would 'suddenly' not be available.  Asking the admin for a status would be far better than a guess from this forum.  Now, if the admin can't figure out the problem, then there is a standard troubleshooting path to follow for licensing issues (i.e. step 1 gather and review the licensing logs).