Invalid License File
If you have received “Invalid License File” error on your server, you can follow below steps to resolve the same.
1. Restart cPane servicel:
/etc/init.d/cpanel restart
OR
service cpanel restart
2. If restarting cPanel didn’t fix the problem run this command:
/usr/local/cpanel/cpkeyctl
You can also verify your cPanel License using following URL