debug problem

when i try to debug this program
in the log file i am getting this error
"An attempt was made to initialise an object in the null part"

i think problem lies in the function "formSection"

Code:

#pragma warning(disable:4786)
#pragma warning(disable:4996)
#include <vector>

#include "common.h"
#include"defGeometry.h"

#include <uf.h>
#include<uf_vec.h>
#include<uf_curve.h>
#include<uf_part.h>

using namespace std;

void defGeometry::populateGeometry(int nthPoint1, int nthPoint2)
{
	//Initializing variables
	//Points that controll the split of splines

	nthN1Point = nthPoint1;
	nthN2Point = nthPoint2;

	for(int i=0;i<ActionSide.NumberOfSections;i++)
	{
		tag_t	Spline1_tag=NULL_TAG,
				Spline2_tag=NULL_TAG,
				Spline3_tag=NULL_TAG,
				Spline4_tag=NULL_TAG;

		struct Section Spline1,
					   Spline2,
					   Spline3,
					   Spline4;
		geometricSection tempGeomSect;
		
		Spline1 = formSection(ActionSide.Sections[i],ReactionSide.Sections[i]);
		Spline1_tag = createSplineThruPoints(Spline1);
		
		Spline2 = SectionXtractPoints(ActionSide.Sections[i]);
		Spline2_tag = createSplineThruPoints(Spline2);

		Spline3 = SectionXtractPoints(ReactionSide.Sections[i]);
		Spline3_tag = createSplineThruPoints(Spline3);

		/*Spline4 = formSection(ReactionSide.Sections[i],ActionSide.Sections[i]);
		Spline4_tag = createSplineThruPoints(Spline4);*/

		tempGeomSect.section_tags["spline1"] =Spline1_tag;
		tempGeomSect.section_tags["spline2"] =Spline2_tag;
		tempGeomSect.section_tags["spline3"] =Spline3_tag;
		tempGeomSect.section_tags["spline4"] =Spline4_tag;

		sections.push_back(tempGeomSect);
		//This is temp function need to be deleted
		//UF_PART_save();
	}
}
Section defGeometry::formSection( struct Section Section1,struct Section Section2)
{
	int j;
	
	struct Section defGeomSecTemp;
	
	for(j=nthN1Point;j>=0;j--)
	{
		defGeomSecTemp.Points.push_back(Section1.Points[j]);
	}
	
	for(j=1;j<nthN2Point;j++)
	{
		defGeomSecTemp.Points.push_back(Section2.Points[j]);
	}
	
	defGeomSecTemp.NumberOfPoints = defGeomSecTemp.Points.size();
	defGeomSecTemp.NumberOfPoints = nthN1Point+nthN2Point;
	//nthN1Point=NumberOfPoints-(nthN1Point+nthN2Point-2)+nthN1Point;
	//nthN2Point=NumberOfPoints-(nthN1Point+nthN2Point-2)+nthN2Point;


	return  defGeomSecTemp;
}
Section defGeometry::SectionXtractPoints(struct Section Section1)
{
	int j;
	struct Section defGeomSecTemp;
	for(j=nthN1Point-1;j<NumberOfPoints-nthN2Point+1;j++)
	{
	  defGeomSecTemp.Points.push_back(Section1.Points[j]);
	}
	defGeomSecTemp.NumberOfPoints=NumberOfPoints-(nthN1Point+nthN2Point-2);

	return defGeomSecTemp;
}

tag_t defGeometry::createSplineThruPoints(struct Section thruSplineData)
{
	int	degree=3,
		periodicity=0,
		save_def_data = 0;
	
	double *p_par=NULL;
	
	tag_t thruSplineTag=NULL_TAG, ReplacedSpline=NULL_TAG;
	
	UF_CURVE_pt_slope_crvatr_t point_data[1000];
	
	for(int i=0; i<thruSplineData.NumberOfPoints; i++)
	{
		UF_VEC3_copy(thruSplineData.Points[i].pt,point_data[i].point);
		point_data[i].slope_type = UF_CURVE_SLOPE_AUTO;
		point_data[i].crvatr_type = UF_CURVE_CRVATR_NONE;
	}
	UF_CALL(UF_CURVE_create_spline_thru_pts(degree, periodicity,thruSplineData.NumberOfPoints,\
											point_data,	p_par,save_def_data,&thruSplineTag));
	
	if(!thruSplineTag)
	{
		sysLogPrint("Failed to create spline %s", thruSplineData.Name);
		return NULL_TAG;
	}
	
	return thruSplineTag;
}

Where in the code does it write that message to the log file?

Code:

defGeomSecTemp.Points.push_back(Section1.Points[j]);

How do you know how many elements Points contains?

BTW, since this is C++, not C, you don't need to say "struct" every time you declare a struct variable... You can just say:

Code:

Section defGeomSecTemp;