virtual-box is not working: "document is empty"
Location: '/home/daniel/.config/VirtualBox/VirtualBox.xml', line 1 (0), column 1.

/build/virtualbox-VDAABr/virtualbox-4.3.36-dfsg/src/VBox/Main/src-server/VirtualBoxImpl.cpp[536] (nsresult VirtualBox::init()).
NS_ERROR_FAILURE (0x80004005)
Interface : IVirtualBox {fafa4e17-1ee2-4905-a10e-fe7c18bf5554}