Errors when restarting the NetworkManager 3 times

Hello,

I recently downloaded the NetworkDiscovery sample from this page: http://forum.unity3d.com/threads/networkdiscovery-sample.354928/

Everything is working unitl I restart the host 3 times. Then I get the same errors as Qwertyuiop1234 mentioned on the forum page (http://forum.unity3d.com/threads/networkdiscovery-sample.354928/#post-2397578). Since nobody replied in that thread I hope I can get a solution to this error by asking the question again.

Thanks in advance