stackvm: qemu on localhost:5900 died

Question

I am trying to run StackVM. I am running Ubuntu 10.04 LTS in a VirtualBox. I have installed all the prerequisites for running StackVM as listed here. AQemu and other qemu packages are also installed.

I have added one simple linux image (linux-0.2.img) which is available on qemu's site

When I open stackvm in a browser and try to run the added simple linux image I get the following error on the terminal and nothing happens on the browser.

firing up qemu on localhost:5900
{ user: { name: 'foo' }
, disk: { name: 'simple linux' }
, file: 'linux-0.2.img'
, engine: 'qemu'
}
qemu on localhost:5900 died

Can anyone help me to get it running.