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How to Fix Error in VirtualBox error “Failed to open a session for the virtual machine”

I have a virtual machine with Windows XP with a clean installation. I set it as immutable to create a differential machine, so I create a new virtual machine, select the immutable hard disk and create a new snapshot in the new virtual machine folder.

However, when I try to start the virtual machine I get this error:

"failed to open a session for the virtual machine".

Código Resultado:

VBOX_E_INVALID_OBJECT_STATE (0x80BB0007)

Componente:

ProgressProxy

Interfaz:

IProgress {c20238e4-3221-4d3f-8891-81ce92d9f913}

What is the problem? until now I can use differential virtual machines without problems. I have installed the last version or VirtualBox v4.3.4 and the problem persists.

If I set the hard driver as normal and I create a new virtual machine and select this hard drive I

don't have any problem.

1 Answer

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Use the below steps to resolve the VirtualBox Error

Tried editing the VM to change RAM/CPU etc, but it wasn't letting me save it

Deleted the vm (not the data) and tried adding it again, didn't fix it

Tried moving the vbox file to another directory and import it, but it didn't let me move the vbox file so I realized there's a virtualbox process running that's holding a lock on it. So I killed that process and started it again and my VM booted

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