virtualbox.org

everything done, then I click on the cd in side bar and this window pops up

So did the guest additions install when you told it to proceed?
Usually it opens a terminal and asks for your password.

Yes, now with this window opened do I do anything?

If the guest additions installed you just need to close this window. Can you use the toggle (host+f) to go in and out of full screen now? Have you rebooted the guest since you installed the guest additions?

many many thanks. done!

Perryg wrote:OK I edited out the guestaddition.iso entry

Thans Perry,

This solved my problem as well.
My host lost power and aborted my guest with the same error as the OP.
I'm now up and running again

LL

(cannot show the error yet:)

This topic is almost 3 years old. Best not wake the dead.