RFManager.GetListenList missing a definition?

My plug-in has stopped compiling, the line below:
var listeners = RFManager.GetListenList(3760);

Results in a definition not found error. I assume I'm missing a using statement at the top?

Thanks in advance for any help.

I am getting the same exact error:  Error while compiling RaidableBases: 'RFManager' does not contain a definition for 'GetListenList' | Line: 14639, Pos: 49  
It was working on my Halloween map, but when i swapped maps, I noticed RaidableBases wasn't working and I have made 0 changes on plugins.  Sure enough I get this error every time i try a reload.  Which file is that statement in?

edit:  Nevermind, I looked in my main cs plugin file and found the exact line it references.  Whatever it missing, I haven't a clue.  I'll try seeing if the dev has updated...sure enough, he has.  i uploaded the new CS file and it compiled and loaded no problem.  Make sure you get the latest plugin file.  I put the line changes below.

My Current:  TryInvokeMethod(() => RFManager.GetListenList(1).RemoveAll(obj => !BaseEntityEx.IsValidEntityReference(obj)));

Updated:  TryInvokeMethod(() => RFManager.GetListenerSet(1).RemoveWhere(obj => obj == null || !BaseEntityEx.IsValidEntityReference(obj)));