Called when a nick change fails.
This method can be called under 2 conditions: It can arise when the user is already registered with the IRC server and is trying change his nick. Or when the user is trying to register for the first time with the IRC server and it fails.
Note that if the later arises then you will have to manually complete the regsitration process.
Assembly: Sharkbite.Thresher (in Sharkbite.Thresher.dll)