Oups... I can't display it !!!
Could you please post a simple template :)
Copy the file LineMA.mq4 to the path "C:\Program Files\MetaTrader 4\experts\indicators\", and compile it.
After that drag it from the "Custom Indicators" section of Navigator window and attach it to the chart.
I have tested it and have got a picture like the following:
So it works.
If you have any questions, you can contact author.