This very short tutorial will explain how to fix the error message “Failed to open a session for the Virtual Machine
- Right-click (Mac users hold down the Control button and then click) the Virtual Machine that’s ‘broken’. From the ‘pop-up’ menu select Discard saved state…
- When prompted for confirmation click Discard
- Now your Virtual Machine’s state will be set to Powered Off, and you can start it as you normally would.
- The OS will power up and start as normal.