Hi vadymmyk-
Sorry to hear you're having this issue. A few questions:
-What OS are you using?
-What is the plug-in/is it the latest version?
-Do you have the newest iLok Manager installed?
As a preliminary suggestion, I would use iLok Manager to remove the license from your device, reinstall the plug-in, and then move the license back to your iLok/computer.
Best,
Tom
