Vray sketchup 2018 failed to checkout v-ray render lincense


I have a big problem, if i want to render v-ray shows this " failed to checkout v-ray render lincense"
I can see that my license is in use and active, it’s shows a green dot.

login logout, reinstall the license server, i have al tried but nothing helps.
on the chaosgroup forum i found a post, where they told to delete the cgauth.dll file. also not working.

can somebody help?

When did you bought it? What version?
Is it perhaps a 1-year license?
Are you logged in with the right username?
(Try logging out and back in at localhost:30304)