I have tried to create a MT4 indicator and need some advice to make it work.

I have tried to create/convert a MT4 indicator and it is now error free and there is no array out of range message.

This indicator is an attempt to convert the "[RS]ZigZag Percent Reversal" indicator from Tradingview, it was first published by Richardosantos in Sept 2018. 

Need someone to help me make it work and will also need to answer some general coding questions.