You may receive an error message when you try to import a third-party indicator.
To find where this error comes from, you will need to compile indicators. Please follow step-by-step instructions written by NinjaTrader on this page: https://ninjatrader.com/support/forum/forum/ninjascript-educational-resources/tips/4833-how-do-i-resolve-ninjascript-programming-errors#post671968