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I am developing mods with Minecraft Forge 1.12.2. I wrote such code. Players get "no permission" error. How do I solve it?

       Event.registerServerCommand(new CommandBase()
        {
            @Override
            public String getName() {
                return "Home";
            }
            @Override
            public String getUsage(ICommandSender Sender)
            {
                return "Home -> Home saving and teleporting command.";
            }
            @Override
            public void execute(MinecraftServer Server, ICommandSender Sender, String[] Args) throws CommandException
            {
                EntityPlayer Pl = (EntityPlayer) Sender;
                String Username = Pl.getName();
                if (Args.length >= 1)
                {
                    if (Args[0].equals("Set"))
                    {
                        if (Functions.FileExists("Mucosoft/PlayerHomes/" + Username + ".txt"))
                        {
                            MinecraftFunctions.SaveLocation(Sender, "Mucosoft/PlayerHomes/" + Username + ".txt");
                            BlockPos Loc = Pl.getPosition();
                            String X = String.valueOf(Pl.getPosition().getX());
                            String Y = String.valueOf(Pl.getPosition().getY());
                            String Z = String.valueOf(Pl.getPosition().getZ());
                            HomeLocations.put(Username, X + "," + Y + "," + Z);
                            MinecraftFunctions.SendMessage(Sender, MinecraftFunctions.MsgType.Success, "Home location updated.");
                        }
                        else
                        {
                            Functions.CreateFile("Mucosoft/PlayerHomes/" + Username + ".txt");
                            MinecraftFunctions.SaveLocation(Sender, "Mucosoft/PlayerHomes/" + Username + ".txt");
                            BlockPos Loc = Pl.getPosition();
                            String X = String.valueOf(Pl.getPosition().getX());
                            String Y = String.valueOf(Pl.getPosition().getY());
                            String Z = String.valueOf(Pl.getPosition().getZ());
                            HomeLocations.put(Username, X + "," + Y + "," + Z);
                            MinecraftFunctions.SendMessage(Sender, MinecraftFunctions.MsgType.Success, "Home location created.");
                        }
                    }
                    else if (Args[0].equals("Go"))
                    {
                        if (HomeLocations.containsKey(Username))
                        {
                            String[] Data = HomeLocations.get(Username).split(",");
                            Double X = Double.valueOf(Data[0]);
                            Double Y = Double.valueOf(Data[1]);
                            Double Z = Double.valueOf(Data[2]);
                            Pl.setPositionAndUpdate(X, Y, Z);
                        }
                        else
                        {
                            MinecraftFunctions.SendMessage(Sender, MinecraftFunctions.MsgType.Error, "Missing home location.");
                        }
                    }
                    else
                    {
                        MinecraftFunctions.SendMessage(Sender, MinecraftFunctions.MsgType.Error, NoArg);
                    }
                }
                else
                {
                    MinecraftFunctions.SendMessage(Sender, MinecraftFunctions.MsgType.Info, "/Home Set\n/Home Go");
                }
            }
        });