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Batch task failed: Object reference not set to an instance of an object

I am trying to make batch job but every time I run it I get this error log

any batch give the same error even as sample as this batch:

 DialogField dialogMyParameter;

    str myParameter = "Default value";

    #define.CurrentVersion(1)
    #localmacro.CurrentList
        myParameter
    #endmacro

    public container pack()
    {
        // This method is used by batch platform to serialize batch parameters in a container
        return [#CurrentVersion, #CurrentList];
    }

    public boolean unpack(container _packedClass)
    {
        // This method is used by batch platform to deserialize batch parameters from stored 
        // batch parameter container

        Integer version = RunBase::getVersion(_packedClass);
        container packedData;

        switch (version)
        {
            case #CurrentVersion:
                [version, #CurrentList] = _packedClass;
                break;
            default:
                return false;
        }

        return true;
    }

    public Object dialog()
    {
        // This method is invoked when user opens batch parameter dialog
        // It helps to add parameters to batch class and set their default value

        DialogRunbase dialog = super();

        dialogMyParameter = dialog.addField(enum2Str(Types::Integer), "My Parameter");

        // Set a default value of parameter
        dialogMyParameter.value(myParameter);

        return dialog;
    }

    public boolean getFromDialog()
    {
        // This method is invoked by batch platform to read the values of parameters from batch 
        // parameter dialog method
        myParameter = dialogMyParameter.value(); 

        return super();
    }

    public void run()
    {
        // This method is the entry point for the batch class

        info("Batch job started!");
        // Access the parameter value entered by the user
        info("My Parameter: " + this.myParameter);
        // Your main batch logic goes here
        info("Batch job completed!");
    }

    public static void main(Args _args)
    {
        // This method is used to create an instance of the batch class, prompt the user 
        // for input using dialog, and then execute the batch job using run().

        MyBatchClass batch = new MyBatchClass();
        if (batch.prompt())
        {
            batch.run();
        }
    }

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