Chaos Project

So the story is that I'm working on my 11th grade programming class's final project. We have to make a game in C#. Not so strong in C# so I kinda need your help guys fixing this error I'm getting or at least tell me what it means.

The error says: "A local variable named 'output' cannot be declared in this scope because it would give a different meaning to 'output', which is already used in a 'parent or current' scope to denote something else.

SORRY FOR BEING NOOB :)

Here's a screenshot in case you guys need one:

It means you are attempting to create a local variable that uses the same namespace as another defined in its super class. Don't label it as "output". Pick another name.

Thanks lots mastah