"Attempt to call a table value" when changing a part's color on click?

My code is hooked up to a button that's supposed to change a part's color when clicked. But when its clicked, it just keeps giving me the error "attempt to call a table value". I've even tried the code by itself, and it works perfectly. So I don't really understand what's going on.

local ClickDetector = script.Parent:FindFirstChild("ClickDetector")
function OnClick()
	for i,v in pairs(workspace.Baseplate:GetChildren()) do
		if v:IsA("Part") and v.Name == "Door" then
			v.BrickColor = BrickColor.new("Medium stone grey")
		end
	end
end

ClickDetector.MouseClick:Connect(OnClick)

idk, try this:

local ClickDetector = script.Parent:FindFirstChild("ClickDetector")
function OnClick()
    for i,v in pairs(workspace.Baseplate:GetChildren()) do
        if v:IsA("Part") and v.Name == "Door" then
            v.Color3 = BrickColor.new("Medium stone grey").Color
        end
    end
end

ClickDetector.MouseClick:Connect(OnClick)

SOLUTION: Instead of changing the actual BrickColor, I just used RGB values and it works perfectly.

local ClickDetector = script.Parent:FindFirstChild("ClickDetector")
function OnClick()
	for i,v in pairs(workspace.Baseplate:GetChildren()) do
		if v:IsA("Part") and v.Name == "Door" then
			v.Color = Color3.fromRGB(163, 162, 165)
		end
	end
end

ClickDetector.MouseClick:Connect(OnClick)

ClickDetector.MouseClick:Connect(OnClick())

You are missing a set of brackets.