It is so simple which means the answer is probably obvious.
Here is my script.
script.Parent.Touched:connect(function(hit)
if hit.Name == "Copper" then
workspace.Tycoon.Collector.Cash.Value = workspace.Tycoon.Collector.Cash.Value + 2
end
end)
This is my error: Collector is not a valid member of Model
I realize the code can be shortened. I had it shortened with a variable but I removed it to see if it was causing a problem.
I checked the spelling, model location, made sure everything was right but it is still giving an error. Even when I use code completion it gives the same error. This has me really confused...

2 comments
I am going to accept this answer just because it is here. A script was constantly changing the name of the collector model to show the ammount of money.
This script would indeed, not work, due to using Cash's value in the 'collector' variable, which would 'remember' the original value, not the changed value.