Using string to find object in Workspace?

I have a GUI that allows the player to insert a string value that the script will find that object in the workspace. For example the player inserts 'game.Workspace.Sound' in the TextBox then the script will find the Sound and do the script.

Error I'm getting

attempt to perform arithmetic (div) on nil and number

game["Run Service"].RenderStepped:Connect(function()
	while playing == true do
		wait()
	local sound = SoundLocation.Text -- TEXTBOX
	u1 = sound.PlaybackLoudness / 70; -- ERRORS HERE
	u2 = sound.PlaybackLoudness / 750;
	l__TweenService__4:Create(workspace.CurrentCamera, TweenInfo.new(u3:NextNumber(0.05, 0.1), Enum.EasingStyle.Linear, Enum.EasingDirection.Out), {
		CFrame = workspace.CurrentCamera.CFrame * CFrame.Angles(math.rad(u3:NextNumber(-u1, u1)), math.rad(u3:NextNumber(-u1, u1)), math.rad(u3:NextNumber(-u1, u1)))
	}):Play();
	end
end);

I think it's because you set sound to this variable

local sound = SoundLocation.Text

wich is finding "Text", and then you're doing

u1 = sound.PlaybackLoudness / 70;

but from what I know Text doesn't have a property named PlaybackLoudness, you should try doing

local sound = SoundLocation

so its finding SoundLocation, that has the property called PlaybackLoudness. I hope the problem is fixed!