WHPX: No accelerator found

Hi,

I have a problem with core virtual booting, the following message pops up at start up:

"WHPX: No accelerator found, hr=00000000 failed to initialize whpx: No space left on device"

here the settings:

 Windows hyper platform and Hyper-V enabled in windows features and Reebot already done as suggested in other posts with same problem.

Do you have any idea about how to solve this issue?

thanks in advance!