enter image description here i'm debugging ironpython app in VS, i have confirmed the JObject's instance 'extendObj' is not null, why it cannot be accessed with extendObj.Remove method? does anyone know the reason (i'm a new with ironpython)?

enter image description here debugging error oaccured in line 39 and the trace stack is : Error occured: Microsoft.Scripting.ArgumentTypeException: NoneType is not callable 在 Microsoft.Scripting.Interpreter.ThrowInstruction.Run(InterpretedFrame frame) 在 Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame) 在 Microsoft.Scripting.Interpreter.LightLambda.Run4[T0,T1,T2,T3,TRet](T0 arg0, T1 arg1, T2 arg2, T3 arg3) 在 System.Dynamic.UpdateDelegates.UpdateAndExecute3[T0,T1,T2,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2) 在 <unnamed>$6.DataChanged$37(PythonFunction $function, Object e) 位置 E:\Codes\DemoSln\PythonApplication\Empty.py:行号 39

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