After that, excute the below command to list the VM Machines.ĥ. Type the following command and press Enter:Ĥ. Start a Command Prompt as Administrator.ģ. In order to fix the issue, simply to remove the following line from the above locations:Ģ. The error “ Duplicate config values ‘/CPUM/CMPXCHG16B’ and ‘/CPUM/IsaExts/CMPXCHG16B’ – please remove the former! (VERR_DUPLICATE)“, appears because the “CMPXCHG16B” CPU instruction is enabled on both the “VirtualBox.xml” file (C:\Users\Username\.VirtualBox\VirtualBox.xml), and on Virtual Machine’s. Interface: IConsole ” How To Fix VirtualBox Error 0x80004005: Failed to open session for VM – Duplicate config values CMPXCHG16B and IsaExts/CMPXCHG16B ĭuplicate config values ‘/CPUM/CMPXCHG16B’ and ‘/CPUM/IsaExts/CMPXCHG16B’ – please remove the former! (VERR_DUPLICATE).
“Failed to open a session for the virtual machine. VirtualBox Error 0x80004005: Failed to open session for VM
