attempt to perform arithmetic on field 'SellingValue' (a userdata value)?

what does "attempt to perform arithmetic on field 'SellingValue' (a userdata value)" mean? I have it so that the value of something is the value NumberValue - SellingValue

here is my script

money = script.Parent.Parent.Money

function onTouched(hit)
	if hit.Name == "TycoonBrick" then
	hit:remove()
	money.Value = money.Value + 25
	elseif hit.Name == "UpgradedTycoonBrick" then
	hit:remove()
	money.Value = money.Value + script.Parent.Parent.Parent.SellingValue
	end
end

script.Parent.Touched:connect(onTouched)

Thanks

script.Parent.Parent.Parent.SellingValue

is an object, not a number, and you can't add to an object. You need to get its Value, which will contain a number.

script.Parent.Parent.Parent.SellingValue.Value

Is SellingValue an instance? If so, on line 9 do money.Value = money.Value + script.Parent.Parent.Parent.SellingValue.Value

yogipanda, ehm the thing because it is happening due to a error in scripting if the 'SellingValue' is a specific value then add mostly value or SellingValue.Value and it may work.