How to fix VirtualBox 'Failed to open a session' error

Here are other solutions for the same error:

[pietromaranatha]

i got this error
"Failed to open a session for the virtual machine VT-x is not available (VERR_VMX_NO_VMX). Result Code: E_FAIL (0x80004005) Component: ConsoleWrap Interface: IConsole

how to fix it?
i try it for use my genymotion...
i'm using os win7, i uses latest version of genymotion and oracle vm virtual box 5.04

[AromaKitsune]

Not working for me, still getting this goddamn Error Code...

[Ellie.V]

I have found the solution it works for me hope it will work for you
Click on the arrow of start button and select Headless start or Detachable

[hibyew]

for me this comes


Failed to open a session for the virtual machine Windows 7 OS.

VT-x is disabled in the BIOS for all CPU modes

Result Code: E_FAIL (0x80004005)
Component: ConsoleWrap
Interface: IConsole

[plop]

wow it worked!









the dislike button worked!

[leonvanderschaaf]

It says VERR_MODULE_NOT_FOUND. I'm using Virtualbox 4.3.30.

[jesus_plaza]

If this fix doesn't work, try downloading the latest update. Worked for me

[somosprolongaciondelsolasu]

1st u aint even checked the error number and description so how can u aford wich kind of error are u talking THERE WASNT ANY ERROR but a MISTAKE in the configuration from you wich is obviously indicated as an error but it-s NOT a VM error but YOURS....if u give a VM an instruction about install the OS from a device IS OBVIOUS THE DEVICE HAVE B WITHHH A MEDIUM CONTAINING THE PROPER OS MOUNTED is this a joke i guess...cause u simply CANT B SUCH A "SIMPLE" "MIND"...

[swj-timetravelerr]

keep up the good work wish u good luck in Life

[kirillololoshka]

Failed to open a session for the virtual machine 444.The virtual machine '444' has terminated unexpectedly during startup with exit code 1.Result Code: E_FAIL (0x80004005)Component: MachineInterface: IMachine

[justinpettit]

i change mine to vhd and it worked thank you

[hefese]

I encountered the same problem in Virtualbox when I started the VM. In my scenario problem stemmed from another open VMs. These VMs was using CPU exteremely high. Then last VM couldn't utility CPU. Thereby last VM throwed "verr unresolved error". When I shutdowned the open VMS, error in the last VM disappeared.

[pradeepkumbar]

where is the link to download iso file

[sigmagamerlife]

I did everything like you and again it won't work, they had some other solution

[ibad]

don't work for me
the same error

[NorthernStarNE]

For people that tried this tutorial with no success - Look at the details on the error message, the most common error is "VT-X is disabled in the BIOS for all CPU modes." meaning that virtualisation is disabled in the bios, all you need to do is go into the bios and check, its commonly under system security or Advanced settings within the CPU settings.

[Its.my.pleasure]

Problem till not resolved. I trying with windows 7😭

[chukas]

Failed to open a session for the virtual machine okok.

VT-x is disabled in the BIOS for all CPU modes

Result Code: E_FAIL (0x80004005)
Component: ConsoleWrap
Interface: IConsole

[ammarmalik]

Runtime error opening 'C:\Users\Ammar Galaxy Note 3 - 4.3 - API 18 - 1080x1920\Samsung Galaxy Note 3 - 4.3 - API 18 - 1080x1920.vbox' for reading: -103(Path not found.).
(long __cdecl

how to fix this virtul device inaccessibal error ? in virtualbox

[aquagaming]

after doing this also still I am facing the same problem please help