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Need Help With ChartSetSymbolPeriod No Data

Hi there, really could use some help here. My code is pretty simple, I drag the EA onto a chart template and it get's the values from a Fibonacci indicator on the template. The problem is when I call the ChartSetSymbolPeriod method when iterating between periods or symbols I either get object data

will my ea fire without windows being tiled?

i'm running an ea on about10 pairs and i would rather only have one chart on the screen at a time and the rest in tabs at the bottom. if all the pairs have the ea activated will that still work even if 9 of the charts are below in the tabs and not live on the screen as tiled windows? thanks