I downloaded the iTETRIS Virtual Machine from the download section. But I am not able to install ubuntu on a virtual machine.

At the beginning it seems like the virtual machine trys to boot from the iso but after a while I receive the following error:
“(initramfs) Unable to find a live medium containing a live file system”.
The same error appears in virtual box and vmware player. Windows 7 is installed on my pc.

Does somebody know how I can solve this problem?