I get this error when I try to start the machine. There are free IP addresses (both floating and fixed). I tried to look about it on the web, but no luck (there is an answer somewhere which doesnt solve my problem).
Here the entire traceback: http://pastebin.com/vB0gm1GH
Thank you.
I solved it after all. The problem is that every project needs it's own fixed network (that's why my main project was working, because i added the network during the installation).