[Resolved] VirtualBox NS_ERROR_FAILURE (0x800004005)

[Cric75]

Hello,

I've been using a Windows 7 VM with VirtualBox on macOS Mojave (10.14.3) for a few months now, and this error message pops-up since a few days while executing any VM.

Print screen of the error message to come soon.

I've tried with no success to:

• Uninstall / Reinstall VirtualBox
  Delete my Windows 7 VM and import it again
  Create a new VM and run it

I've also tries a few tricks read in forums, but none of them worked.

Thanks in advance for your help!

[socratis]

this error message pops-up since a few days

What happened in the last few days, what changed?

while executing any VM

Any VM? So, this isn't a VM-specific issue?

Print screen of the error message to come soon.

Please attach the image locally in your response (see the "Upload attachment" tab below the reply form). Not a lot of people will go to 3rd party sites. Plus, it's more convenient if the image goes along with the message...

Also, if you're using a HiDPI setup, please shrink the image by at least 50%. Or "Preview" your message...

[Cric75]

Hello socratis,

What happened in the last few days, what changed?

I'm not sure about that, I think I had a message saying there was an update for Extension Pack, but it seemed I was up to date and nothing happened. Then when I ran the VM, I got this error message.

Any VM? So, this isn't a VM-specific issue?

Nope, but I only have one VM! When deleting and creating a new VM, the message pops-up again.

Please attach the image locally in your response (see the "Upload attachment" tab below the reply form). Not a lot of people will go to 3rd party sites. Plus, it's more convenient if the image goes along with the message...

Ok, I'll do that.

Also, if you're using a HiDPI setup, please shrink the image by at least 50%. Or "Preview" your message...

Sorry, I don't now what HiDPI setup is

[socratis]

We need to see a complete VBox.log, from a complete VM run, where the problem occurs:

• Start the VM from cold-boot (not from a paused or saved state) / Observe problem / Shutdown the VM (force close it if you have to).
• With the VM completely shut down (not paused or saved), right-click on the VM in the VirtualBox Manager and select "Show Log".
• Save only the first "VBox.log", ZIP it and attach it to your response.

I'm not sure about that, I think I had a message saying there was an update for Extension Pack, but it seemed I was up to date and nothing happened.

Then something didn't happen right. Download the ExtPack manually, go to the VirtualBox Preferences » Extensions, remove what's there and install the one that you just downloaded.

[Cric75]

We need to see a complete VBox.log, from a complete VM run, where the problem occurs:

• Start the VM from cold-boot (not from a paused or saved state) / Observe problem / Shutdown the VM (force close it if you have to).
• With the VM completely shut down (not paused or saved), right-click on the VM in the VirtualBox Manager and select "Show Log".
• Save only the first "VBox.log", ZIP it and attach it to your response.

Interesting enough, I don't have any log (see print screen).

Then something didn't happen right. Go to the VirtualBox Preferences » Extensions, remove what's there and install the one that you just downloaded.

No such luck... See print screen.

[socratis]

It's usually easier, more convenient, smaller size, searchable and quotable, if you use that "Copier" button in the error dialog, and simply paste the error text, instead of posting the image...

Your error is clear:

The owner is not root: '/Applications'.

You have messed up permissions in your host. See the thread "Mojave 10.14.5 Host - Failed to Open Session / Ext Pack Install Failure" for the discussion and some ideas on what might have caused this.

The solution is to run the command:

• sudo chown root:admin /Applications

[Cric75]

It's usually easier, more convenient, smaller size, searchable and quotable, if you use that "Copier" button in the error dialog, and simply paste the error text, instead of posting the image...

Sorry about that.

Your error is clear:

The owner is not root: '/Applications'.

You have messed up permissions in your host. See the thread "Mojave 10.14.5 Host - Failed to Open Session / Ext Pack Install Failure" for the discussion and some ideas on what might have caused this.

The solution is to run the command:

• sudo chown root:admin /Applications

You are my hero of the day!
My VM works fine now

[socratis]

Glad you got it going, marking as [Resolved].