I would start by changing the indicator adding () to make sure it captures what you need:
is it (100/iMA(NULL,0,200,0,MODE_EMA,PRICE_CLOSE,i+1))*Low[i] ?
If you add the low it is not really "a percentage difference between the price and the ema200."
When you generate an indicator it tells you how to use it in the screen: you get:
//***Read this first: Integration with Molanis Strategy Builder***
/*To integrate this indicator with Molanis Strategy Builder use the following modes:
Mode 0 = 100/iMA(NULL,0,200,0,MODE_EMA,PRICE_CLOSE,i+1)*Low[i];
For the indicator and ea to work it has to be in the indicator directory - you need there both filed the ex4 and the mq4
As per the ea, you need to use the import option, and import the mq4 file. It will give you something like "AbstandGD200" - your error was just to write the name like AbstandGD200 missing the ""
For other users to understand more see
viewtopic.php?f=2&t=6142&start=0