What does the Unity Compiler Error:MissingMethodException:UnityEngine.Input.FireButton Boo.Lang.Runtime.DynamicDispatching.MethodDispatcherFactory.ProduceExtensionDispatcher() mean, what does it do and how do I fix this problem

I have a Compiler Error (at least that’s what I think it is) that says MissingMethodException:UnityEngine.Input.FireButton Boo.Lang.RuntimeDynamicDispatching.MethodDispatcherFactory.ProduceExtensionDispatcher() and I want too know what this all means, what does it do and how do I fix this problem.

It’s saying that it’s missing the method…

Something is supposed to be there…and it’s not.

Post up the code that’s actually throwing the error.