I have made an indicator that has been able to compile and work very well for many months. Lately, I need to change a little something in it. However, I couldn't compile it. It generate an error saying that 'ChartHelper' does not exist in the current context. I'm sure that the error has nothing to do with what I have changed in the code, since I have only tweaked a few numbers in it. Also, I have an older computer that has a backup copy of ninjatrader, I was able to compile the indicator there. I wonder what I can do to fix this. Maybe I need to reinstall the previous version of Ninjatrader.
Thank you!

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