Why does it say MouseButton1Click is not a valid member of ClickDetector?

When I test out my group owner only door; in the output it says MouseButton1Click is not a valid member of ClickDetector. I have no clue how to fix this.

GroupId = 3348123

script.Parent.ClickDetector.MouseButton1Click:connect(function(p)
    if p:GetRankInGroup(3348123) ==255 then
    if script.Parent.Transparency == 0 then
        script.Parent.Transparency = 1
    script.Parent.CanCollide = false
    else
    script.Parent.Transparency = 0
    script.Parent.CanCollide = true
    end
    else

    end
end)

Please help me, thank you!