can not boot again VM with tails

[Gottfried]

Hi Chris,

I was so glad that with your and other Guixers help I was able to set up 
my VM
but when I installed Tails on it, from an iso. in my Download folder
I used it for one session.
Then I closed my VM,
and now I can't start Tails any more.
I installed tails in my VM 3 times and always the same problems.

It says:

Booting from Hard Disk...
Boot failed: not a bootable disk
No bootable device.
See Attachment

So how do you do it?
After using your VM, how do you finish up,close the VM?

Gottfried

VM Tails can not start.png
Description: PNG image

OpenPGP_0x61FAF349C9FB7F94.asc
Description: OpenPGP public key

OpenPGP_signature
Description: OpenPGP digital signature