There is a strategy and an indicator communicating:
The strategy calls a method of the indicator in order to place a mark on the chart (of course it is a bit more complicated than this, but the error is here), the point is, that the call for the method comes from outside, not from the OnBarUpdate method.
Drawing horizontal line works fine, but drawing methods where I need to set "barsago" throw this error message.
What the problem could be?
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