This is not a product issue rather it is related to Pega Academy, have you post your question there?

Here's a link to PegaAcademy's UI Specialist Course forum:

https://pdn.pega.com/forums/pega-academy/user-interface-specialist

Though, by all means if you want to leave this open for a bit on the off-chance it catches someone's eye and they know the answer. We're here to help. I'll check back on this and reference any response to get to close it out.

Thanks.

B.

check if this helps: VirtualBox: Import on different platform (INOUE Katsumi @ Tokyo)

I just tried the VM you mentioned, I did see the same error when I first tried to start the VM, but you can ignore it, the VM started up fine. After that, the message will not come up again.