Help with the tonumber?

I have the script below in a button, with a numvalue in the button also. The levels are explained below:

1. Input (Button)
   1. Script /
   2. Value (Number Value)

script.Parent.Changed:connect(function()
	script.Parent.Value.Value = tonumber(script.Parent.Text)
end)

Anyone know why this doesn't work?

If it doesn't work, then at some point 'script.Parent.Text' wasn't a number. I dont see any other reason for this not to work.