The Issue : Error message : NinjaTrader.Indicator.xxx could not be deserialized : There is an error in XML Document (1,2038)
The cause of the problem is that you saved your indicator's settings as default then you changed the indicator setting during development or due to update and the old saved as default setting are no more valid/available.
Solution: All you need to do is to ignore the error message and double click your indicator to add it to the chart , then right click and " Set as default for ..." to overwrite the old settings.
This as well leads me to a question on to how to delete old indicator's "saved as default " setting?
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