I'm having this error -- > Workspace.Mdoor.Union.Script:26: bad argument #2 to '?' (Vector3 expected, got Object)

Script was working fine but I had to revert versions because I accidentally lost the script and I can't remember how I fixed this error. Can anyone help?

local rs = game:GetService("ReplicatedStorage")
local r = rs.Remotes:WaitForChild("DoorOpen1")

r.OnServerEvent:connect(function(HRP)
	if (script.Parent.Position - HRP).magnitude <= 3 then --Error Happens Here!
		print(r.Name.. " was fired!")
		local door = game.Workspace.Mdoor:WaitForChild("Union")
		local hinge = game.Workspace.Mdoor:WaitForChild("Hinge")
	
		local hingep = hinge.Position

		for i = 1, 120 do
			door.CFrame = CFrame.new(hingep)* CFrame.Angles(0,math.rad(i),0) * CFrame.new(0.294,0,2.89500)
			wait()

		end
	end
end)

Also I should note HRP is defined as LocalPlayer.Character:WaitForChild("HumanoidRootPart").Position

or to make it easier to understand, other guy is fully correct but here is a code to what he means

local rs = game:GetService("ReplicatedStorage")
local r = rs.Remotes:WaitForChild("DoorOpen1")

r.OnServerEvent:connect(function(player,HRP)
    if (script.Parent.Position - HRP).magnitude <= 3 then --Error Happens Here!
        print(r.Name.. " was fired!")
        local door = game.Workspace.Mdoor:WaitForChild("Union")
        local hinge = game.Workspace.Mdoor:WaitForChild("Hinge")

        local hingep = hinge.Position

        for i = 1, 120 do
            door.CFrame = CFrame.new(hingep)* CFrame.Angles(0,math.rad(i),0) * CFrame.new(0.294,0,2.89500)
            wait()

        end
    end
end)