VirtualBox import error Cannot register the DVD image

I'm running v 4.2.6. Starting this morning, I can't import some VMs, and some of my existing VMs are showing up as inaccessible and have the following error showing in the UI,

The same error too when i took the vm to another PC and try to open it with virtual box (v 5.0.10):

> Cannot register the DVD image > > 'C:\Program > Files\Oracle\VirtualBox\VBoxGuestAdditions.iso' > {f5022f2e-0adc-4767-879d-65058a5578c5} because a CD/DVD image > > 'C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso' with UUID > {fc087cbc-df04-47b4-b42f-25f614463f78} already exists. Result Code: > E_INVALIDARG (0x80070057) Component: VirtualBox Interface: > IVirtualBox {3b2f08eb-b810-4715-bee0-bb06b9880ad2}

I solved it by open the file win 7 64.vbox with text editor and remove the tag:

<DVDImages>
   <Image uuid="{fd686a98-c1a6-42d9-82aa-67728b524d53}" location="C:/Program Files/Oracle/VirtualBox/VBoxGuestAdditions.iso"/>
</DVDImages>

Know that by removing the tag it will be added as empty tag. and reopent the vm of virtual box again. and it worked

Open the .VBOX file in any text editor of your choice.
find the following lines:

[...]
<DVDImages>
        <Image uuid="{b058bc48-c451-4cff-9db0-d01c70e99c28}"
location="/usr/share/virtualbox/VBoxGuestAdditions.iso"/>
     
[...]

Delete all entries between and section. After deleting the contents, your .VBOX file will look like below.

<DVDImages>
</DVDImages>

Save and close the file.

That’s it. Now, you can load the virtual machine without any issues.

I had 2 virtual machines XP-x86 and Win7-x64 and precisely removing tag image uuid the issue got fixed and was able to add the new pre-created VM.

It is because there is a conflict with the existing inserted media. Ejecting the existing drive via Virtual Media Manager might solve it.

Ref: https://forums.virtualbox.org/viewtopic.php?f=8&t=51911

For me none of these answers worked for me. I needed to delete the same lines that are mentioned above. but from C:\Users\USER\\.VirtualBox\VirtualBox.

In my case it was referencing paths that didn't exist.