Invalid cPanel License File
If you receive the following message, then you have an invalid cPanel license:
X-DES-KEY: generate error
Invalid Lisc File
When you log into cPanel WHM, you need to do one of two things:
Check your main server IP at http://verify.cpanel.net to verify that your license is valid. If it is, issue the command /usr/local/cpanel/cpkeyclt which will reset the license file on the server. This should fix your problem.