VirtualBox can not open vbox file: UUID already exists (ISO)

When I try to open the ReactOS vbox image it tells me that the ISOs of the guest addons and ReactOS already exist.

In the screenshot attached you can see the error.

The solution is; Unmount the ISO files (guest-addons, etc.) from the virtualbox before export and upload the box.
The other Solution is to remove the marked lines from the vbox file shown in the other screenshot.