Thanks for asking and I am really sorry for the trouble you are facing while validating X Theme. Let me suggest you some solutions, please try it out and let us know how it goes.
Ensure everything is up to date according to our version compatibility list here. Please follow the best practices when updating your theme and plugins. Click here for more information.
Then go to the licenses page and remove the domain name from there.
After that, follow the instructions below:
If you still have problems kindly get back to us with the URL/User/Pass of your WordPress dashboard using the Secure Note functionality of the post to follow up the case.