Plugin fails to load with the error below. I tried removing the EnableServerFall lines, but the plugin still doesent load.

Failed compiling 'TeamBattlefield.cs':
1. 'BasePlayer' does not contain a definition for 'EnableServerFall' and no accessible extension method 'EnableServerFall' accepting a first argument of type 'BasePlayer' could be found (are you missing a using directive or an assembly reference?) [CS1061]