I just added extension pack and my Windows machines won't start. This is the error I get:
Failed to open a session for the virtual machine Windoze 7.
The device helper structure version has changed.
If you have upgraded VirtualBox recently, please make sure you have terminated all VMs and upgraded any extension packs. If this error persists, try re-installing VirtualBox. (VERR_PDM_DEVHLPR3_VERSION_MISMATCH).
Result Code: NS_ERROR_FAILURE (0x80004005) Component: Console Interface: IConsole {db7ab4ca-2a3f-4183-9243-c1208da92392}
I really don't want to re-install VB all over again, so I am hoping to find another solution. I tried some of the other suggested solutions but they didn't work for me. How can I fix this?