解决Virtual Box UUID does not match the value stored in the media registry

1. Go to File → Virtual Media Manager
2. In the Hard drives tab, you should see a red exclamation point icon beside the disk image you're having trouble with. Select it →Release → Remove → Close.
3. Go back into the settings for the VM and re-add the disk.

To prevent the error in the future, before deleting the virtual disk image files, remove them from the Virtual Media Manager:

1. Go to File → Virtual Media Manager
2. In the Hard drives tab, find the virtual disk you want to remove, select it →Release → Remove → Keep (or Delete if you want to delete it permanently) →Close.
3. Go back into the settings for the VM and readd the disk.