the verified trial has expired

When I started my application on a virtual machine I get:

the verified trial has expired you must request a trial extension

why happen this? I allowed the license trial also on virtual machine

Any number of reasons:

1. You set the number of trial days to 0.2. You've already used the verified trial on that machine.3. You're messing with the clock and LimeLM detected fraud.

etc., etc.

thanks for the answer, well I restored the virtual machine (reinstalled the os) so I guess it's this