I need help with this script, keeps separating and error shows?

My box keeps separating, I have a make joints and I have a primary part, the first clone works but when it clones, the top part separates.

This is the box script.

op1 = workspace.Box.closee.open1
op2 = workspace.Box.closee.open2
clos = workspace.Box.closee.Closed
clo = game.Workspace.Box.closee
pe = workspace.Box



clos.Transparency = 1 -- this sets the box cover to be open so that it looks normal


function kiki() -- this function will make it so that the foldes will go away when clicked
    op1.Transparency = 1
    op2.Transparency = 1
    print("working") -- for checking
        if op1.Transparency and op2.Transparency == 1 then
            clos.Transparency = 0 -- this and line 16 make sure that if both flaps are closed, the cover will be there
        end
end


clo.ClickDetector.MouseClick:connect(kiki) -- this connects the mouse clicking event to the function

function des()
wait(8)
print("destory")
pe:Destroy()

end       

This is the cloning script.

box = game.ReplicatedStorage.Box
boxPri = box.Union
dopPos = script.Parent.Donpe

while true do
    print 'NOW DROPPING'
    wait(7)
    box:Clone().Parent = workspace
    box:MakeJoints()
    box.Union.CFrame = dopPos.CFrame
end

error

16:55:38.696 - open1 is not a valid member of Model