Unhandled exception in MyProject.exe(MSVCRTD.DLL)0xc0000005:Access violation,该怎么

Unhandled exception in MyProject.exe(MSVCRTD.DLL)0xc0000005:Access violation
程序编译通过，在执行时出现Unhandled   exception   in   MyProject.exe(MSVCRTD.DLL)   0xc0000005:Access   violation。请各位高手指点！

                  int   len0   =   m_prToothPointsVertexList[0].size();
double   **pPoints0;
                  pPoints0   =   new   double*[len0];
for(int   i0   =   0   ;   i0   <   len0;   i0++)
{
pPoints0[i0]   =   new   double[3];
for(int   j   =   0   ;   j   <   3   ;   j++)
{
pPoints0[i0][j]   =   0.0;
}
}

mxArray   *matrix0   =   mxCreateDoubleMatrix(len0,   3,   mxREAL);
double   *pr0   =   mxGetPr(matrix0);
//拷贝数据，从C格式数组→mxArray
memcpy(pr0,   pPoints0,   3*len0*sizeof(double));

程序在memcpy这里出现异常。

[解决办法]
memcpy(pr0, pPoints0, 3*len0*sizeof(double));//pr0为double *，pPoints0为double **类型当然会出错。
我做过测试代码改成如下没错，数据也正确。
int len0 = 10;
double** pPoints0;
pPoints0 = new double*[len0];
for(int i0 = 0 ; i0 < len0; i0++)
{
pPoints0[i0] = new double[3];
for(int j = 0 ; j < 3 ; j++)
{
pPoints0[i0][j] = 1.0;
}
}
double** pr0;
pr0 = new double*[len0];
//拷贝数据，从C格式数组→mxArray
memcpy(pr0, pPoints0, 3*len0*sizeof(double));
double db=pr0[9][2];