udf出错“FLUENT received fatal signal”

matrixmess

源代码
#include <stdio.h>
#include <stdlib.h>
#include "udf.h"

real pos[16000][2];
real x[ND_ND];
Domain *d;
Thread *t;
cell_t c;
FILE *fp;
int i=0,j=0;

DEFINE_ON_DEMAND(print)
{
    d=Get_Domain(1);

        thread_loop_c(t,d)
        {
                begin_c_loop(c,t)
                {
            C_CENTROID(x,c,t);
                        pos[0]=x[0];
                        pos[1]=x[1];
                        i++;
                        Message("x= %e\t y=%e\n",x[0],x[1]);
                }
                end_c_loop(c,t)
        }

    fp=fopen("E:\\bioreator\\coodinate.txt","w");
    for(i=0;i<16000;i++)
               
                {
                        fprintf(fp,"x=%e\t y=%e\n",pos[0],pos[1]);
                }
        fclose(fp);
}

fluent运行完message后报错：
Error:
FLUENT received fatal signal (ACCESS_VIOLATION)
1. Note exact events leading to error.
2. Save case/data under new name.
3. Exit program and restart to continue.
4. Report error to your distributor.
Error Object: ()
这是怎么回事呢？