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Object reference not set to an instance of object

Object reference not set to an instance of object

Object reference not set to an instance of object

(OP)
Hi everyone. who knows about NXopen? I have a mistake at line 73 which sounds so "Object reference not set to an instance of an object". I build several splines by points joined into groups. after building one group, this error occurs and the splines do not build further.

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