Hi,
Vray requires a license to use. If you have a license and are still getting this error you should contact Chaos Group support: https://www.chaosgroup.com/support/faq/how-do-i-contact-technical-support - they can sort out the issue for you.
Here is a FAQ that includes an explanation of the particular error you are getting: https://docs.chaosgroup.com/display/VRAY3MAX/Installation+FAQ
Daf
i m very hurt about this. i m student and am on learning stage..no any one option to solve this..like crack etc
i m very glad...My solution is solve after replying on this forum....
uninstall vray 3.40..and reinstall new version of vray 3.60 .
now i m enjoying ....