I don't want to just be a "Me Too", but I have also received this error. I'll give some details about my setup:
I have LinuxMCE installed as a dedicated core on a spare machine I had sitting around. It has dual network cards as suggested, and I have it set up with DHCP also as suggested.
I understand from the instructions that I need to add a Media Director (with MAC address) for the machine that I would like to connect to my TV. I have found the MAC address, and the machine is set up to boot from network.
When I go to Wizard->Devices->Media Directors, the list is empty, not surprisingly. I see a header that includes: "Device Room Output Pipes Input Device data Action" etc. and a "Add Device" button. When I click that button it opens a pop-up window titled "Pick Device Template". I have tried many different combinations of manufacturers, templates etc, but no matter what I do when I click the "Pick device template" button the pop-up window closes and I get the error message: ERROR: Error creating device.
I am not very familiar with Linux, so I am pretty willing to assume that I have done something incorrectly. I didn't encounter any errors during the setup process of either Ubuntu or LinuxMCE, so I'm not sure where to look next.
Any help would be greatly appreciated!