Newbie issue. Bar index error

[YevhenShynkarenko]

Hello to all!
Started to write the new strategy. Having trouble in next things.
Want to find index of the bar of the current ZigZag high & low.
Having next code:

        protected override void Initialize()
        {
            CalculateOnBarClose = true;
        
            
        }

        /// <summary>
        /// Called on each bar update event (incoming tick)
        /// </summary>
        /// 
        
            int highZindex = 0;
            int lowZindex = 0;

        
        protected override void OnBarUpdate()
        {
            if(CurrentBar < 20)
                return;

            ZigZag zz = ZigZag(DeviationType.Percent, 0.5, true);
            highZindex = CurrentBar - zz.HighBar(0, 1, CurrentBar);
            lowZindex = CurrentBar - zz.LowBar(0,1, CurrentBar);

            
            
            Print("Current ZigZag High is" + highZindex + Time[lowZindex]);
            Print("Current ZigZag Low is" + lowZindex + Time[highZindex]);

        }

But when I'm trying to run strategy it doesn't works. In log I see next error:
Error on calling 'OnBarUpdate' method for strategy *NAME OF THE STRATEGY* Bar index needs to be greater/equal 0

What do I need to do with this?
Thanks!

[NinjaTrader_PaulH]

Hello YevhenShynkarenko,

Thanks for your reply.

I would recommend commenting out your current code in the OnBarUpdate section and some tests using this print statement to assist:

Print ("CB: "+ CurrentBar+" ZZ: "+ ZigZag(DeviationType.Percent, 0.5, true).HighBar(0, 1, CurrentBar));

Please note that the ZigZag will return a -1 value if a swing point is not found in the lookback period. the print statement will show you the currentbar number followed by the Highbar. I suspect you were getting stuck by the -1 value.

Finally the Print statement show that you had mixed the low and high indexes in the same print statment, example: highZindex + Time[lowZindex]).