Attempt to connect failed: Passed value is not a function?

Attempt to connect failed: Passed value is not a function
please help

if your still having this problem then here's the mistake:

let's say your using a Touched:Connect()

function Touch(Part) -- the function name is Touch and the argument name is Part
   print(Part.Name)
end

workspace.Part.Touched:Connect(Touch) -- the function won't error because it EXISTS

The problem is: the function doesn't exist