hi i'm gettin this error in log

[staycool3_a]

hi my indicator works fine but i'm getting the below error when i trace orders and also in log. why?



Failed to call method 'Initialize' for indicator 'SpreadValue': 'Add' method only accepts positive 'period' values, but was -1 Min

        protected override void Initialize()
        {
            Add(new Plot(Color.FromKnownColor(KnownColor.DarkViolet), PlotStyle.Line, "SPREAD"));
            
               Add(SecondInstrument, BarsPeriods[0].Id, BarsPeriods[0].Value);

            Overlay                = false;
        }
        
        private double a,b,c,d,e=0;

        /// <summary>
        /// Called on each bar update event (incoming tick)
        /// </summary>
        protected override void OnBarUpdate()
        {
            
            if (CurrentBarArray[0] > 0 && CurrentBarArray[1] > 0)
            {
                if (BarsInProgress > 0) 
                {
            
            if(CurrentBars[0] ==1)            
                
            {
            a = CurrentDayOHL(BarsArray[0]).CurrentOpen[0];
            b = CurrentDayOHL(BarsArray[1]).CurrentOpen[0];
            }
            
            if( b > 0 && a >0)
            {
                c = (Closes[0][0]/a)-1;
                d = (Closes[1][0]/b)-1;
                e = (c - d)*50000;    
            }

            SPREAD.Set(e);
            
                }
            }
        }

[NinjaTrader_PaulH]

Hello calhawk01,

Thanks for your post.

The reason for the error is because of how you are adding your additional dataseries. The use of BarsPeriods[0].Id, BarsPeriods[0].Value is not recommended in Initialize because it does not perform consistently, as you have observed. Most of the time it would work and eventually, through the number of passes in initialize, it does seem to work but it will generate the errors you have observed on occasion.

It is recommended to use hard coding of the Value and ID.