quantity invalid

[yasin]

When I run this code, it crashes after a while, why?
quantity invalid

    public async void Start()
    {
        await Task.Delay(10).ContinueWith(_ =>
        {


            for (int ferdi = 0; ferdi < 32; ferdi++)
            {
                modbusClient.WriteSingleCoil(ferdi, true);
                Thread.Sleep(5);
                modbusClient.WriteSingleCoil(ferdi, false);
            }
            for (int j = 31; j > 0; j--)
            {
                modbusClient.WriteSingleCoil(j, true);
                Thread.Sleep(5);
                modbusClient.WriteSingleCoil(j, false);
            }
            Start();
        });

[yasin]

EasyModbus.Exceptions.QuantityInvalidException: 'quantity invalid

[Anonymous]