This error occurs if you use a module type per PC, user or concurrent user and there is no free license available. See error screen sample.
It can also occur
•using a Terminal Server, Citrix or Remote PC session as each session counts a separate license per PC or license per concurrent user. See Network License.
•on a local PC installation with a license per user and multiple users on the PC start the application
•if a USB flash drive is used
If you use EasyGo, click on Show License information. You would see all PC's or users holding the license. It is possible to deactivate a license if it is no longer necessary.
See also: How to add Add additional users / licenses within a network