Hello everyone and wish all of you the best.
This is the second time that it happens.
Just i thought my unraid is running fine, that i noticed that i couldn`t open the smb shared folder(from unraid of crouse) by use my laptop, so i opened unraid server web console, and it said on top right corner: "Missing Key File" , as image#1
and this is how it shows on dashboard:
and this is show on tools/registration menu:
And yes by the way, my key is bought legally on the official unraid page with coupon code, definitely.
Please if anyone could let me know that the problem is on my key or on my USB drive? Thanks a lot really.