Can't get the mouse's target using UserInputService, CurrentCamera, and RayCasting?

What the script does is it takes the UserInputService's mouse position on screen and then uses it to make a ray pointing from the camera, and then trys to use raycasting, but for some reason it isn't working

function getMouseTarget(mousePos)
	local ray = workspace.CurrentCamera:ScreenPointToRay(mousePos.x, mousePos.y, 1000)
	return workspace:FindPartOnRay(ray)
end
print(getMouseTarget(game:GetService("UserInputService"):GetMouseLocation())

this prints out nil, Vector3, nil, Enum.Material.Air which means it isn't hitting a block even though I knew it should have hit one. I've also tried running this while the camera had been inside a block.

What I've found on it but doesn't seem to work:

This says it worked they got an answer, but when I tested it in my game and when I tested it in a script builder it didn't work:

http://scriptinghelpers.org/questions/27647/is-there-a-simple-way-to-get-mouse-hit-position-from-its-screen-coordinates-actually-solved

This also has an answer in the forum that's almost identical, but also doesn't seem to be working:

http://devforum.roblox.com/t/new-mouse-input-query-methods/41304

function getMouseAndTargetLocation(cursorPosition)
    local ray = workspace.CurrentCamera:ScreenPointToRay(cursorPosition.x, cursorPosition.y, 1)
	ray = Ray.new(ray.Origin, ray.Direction * 999)
    print(workspace:FindPartOnRay(ray))
end
getMouseAndTargetLocation(game:GetService("UserInputService"):GetMouseLocation())

Solution requires ending ScreenPointToRay with 1 and then making a new ray from with with a longer direction

This is what I use

local uis = game:GetService("UserInputService")
local mouse = uis:GetMouseLocation
local cam = workspace.CurrentCamera
local length = 100

local function mousepos(mousepos: Vector2): Vector3
	if mouse then
		local unitray = cam:ViewportPointToRay(mousepos.X, mousepos.Y, 0)
		local rayresult = workspace:Raycast(unitray.Origin, unitray.Direction * length)
	end
end

You can use :GetMouse().Target, like this

print(game.Players.LocalPlayer:GetMouse().Target:GetFullName)

Thats just what I think you should use.