Mono; In and Output error

[Hurraa]

Hi,
i am using mono 1.9 and ubuntu 7.10. I want to start the server with mono runuo.exe ( and of course i did compile it with the files of runuoforge ) but the console throws this error:

Server/Utility.cs(1252,125): error CS0030: Cannot convert type `TInput' to `TOutput'
Server/Utility.cs(1252,125): The type `' has two conflicting definitions, one comes from `RunUO, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' and the other from `RunUO, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' (in the previous error)

I searched through the forum and i found some people who had the same error but there was not really a solution for it... Can somebody give me a short advice?

[Hurraa]

Ok there was just one thing to change to solve my problem: Mono!
Just use 1.2.6_6... then it works fine