My Scripts dont work on Multiplayer , Only on Solo ?

I made several scripts was an example interaction with NPCs and Custom Explosions, which were in blocks , All scripts that are not in StarterGui or StarterPack not work in Multiplayer only in Solo , already tried to put in a Local script or in a Normal Script, I tried to use FilteringEnabled or without FilteringEnabled and nothing works, does anyone know what I can do ?

The Script :

IntPart = script.Parent.Interact
Children = script.Parent.Parent.Door:GetChildren()
Children2 = script.Parent.Parent.OpenedDoor:GetChildren()

while wait() do
    for i,v in pairs(game.Players:GetChildren()) do
        if (v.Character.Torso.Position - IntPart.Position).magnitude <= 10 then
            v.PlayerGui.IntGuis[IntPart.Type.Value].Visible = true
            script.Key.Disabled = false

            for i = 1,#Children do
                if Children[i].ClassName == "Part" then
                    Children[i].Transparency = 1
                end
            end
            for i = 1,#Children2 do
                if Children2[i].ClassName == "Part" or Children2[i].ClassName == "UnionOperation" then
                    Children2[i].Transparency = 0
                end
            end
        else
            v.PlayerGui.IntGuis[IntPart.Type.Value].Visible = false
            script.Key.Disabled = true

            for i = 1,#Children do
                if Children[i].ClassName == "Part" then
                    Children[i].Transparency = 0
                end
            end
            for i = 1,#Children2 do
                if Children2[i].ClassName == "Part" or Children2[i].ClassName == "UnionOperation" then
                    Children2[i].Transparency = 1
                end
            end
        end
    end
end