LHC@home

https://lhcathome.cern.ch/lhcathome/result.php?resultid=411481381

This only happens on one computer, which I've rebooted, and reset the project. I can see no mess in Virtualbox environment I usually find when Boinc throws tantrum.

Command:
VBoxManage -q closemedium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Output:
VBoxManage.exe: error: Cannot close medium 'C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\ATLAS_vbox_3.01_image.vdi' because it has 1 child media
VBoxManage.exe: error: Details: code VBOX_E_OBJECT_IN_USE (0x80bb000c), component MediumWrap, interface IMedium, callee IUnknown
VBoxManage.exe: error: Context: "Close()" at line 1862 of file VBoxManageDisk.cpp

Firstly why is the first thing it does to close media? Surely you start by opening a file?
Secondly, why is it complaining it has a child media (presumably something else accessing it, when a) There shouldn't be after a reboot and reset, and b) it's a multi-access file intended to be used for more than one task.

How do I make it run Atlas again? It's computation erroring every single one very quickly.

How do I make it run Atlas again? It's computation erroring every single one very quickly.

Use VirtualBox Manager -> Tools -> on the right the pinned three lines -> Choose Media -> remove the media with a yellow rectangle

That fixed it thanks.