How to add ON_Annotation object to rhino

hi, @suc_kiet i really suggest you to split your code in small parts and isolate your problem by posting the 'breaking point" where the API fail next to a working sample of few lines of code (just to be sure that the problem is surrounded )
if you don’t do that it’s just to cumbersome to start analyzing your code for an issue which might simply not be in your sample code… :expressionless: good luck and i know your pain lol

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