The error is due to RemoteTech adding a new function to an interface, so all the mods using the interface must also add the function. In this case, it's in the base Contract Configurator mod, in the file "RemoteTechProgressTracker.cs", add a line saying "public bool CanRelaySignal { get { return true; } }" somewhere (for example between line 61 and 62 with the other similar lines).
A recompiled version with this modification is here: http://s000.tinyupload.com/index.php?file_id=60326756604568769976