请前辈们帮我看看这个udf有什么问题

fa0025

动网格的，根据边界压力定义节点的运动
进行迭代就会出现
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: #f

源文件：
#include "udf.h"
#include "mem.h"

#define KEY_P 24363
#define ID 28

DEFINE_GRID_MOTION(move, domain, dt, time, dtime)
{
Thread *tf = DT_THREAD(dt);
Thread *tc;
cell_t c0, c1;
face_t f;
Node *v;
int n=0;
tf=Lookup_Thread(domain, ID);
SET_DEFORMING_THREAD_FLAG(THREAD_T0(tf));
begin_f_loop (f, tf)
{
  c0=F_C0(f,tf);
  tc=THREAD_T0(tf);
  f_node_loop(f, tf, n)
  {
   v=F_NODE(f, tf, n);
   if(NODE_POS_NEED_UPDATE(v))
   {
    NODE_POS_UPDATED(v);
    if(NODE_Y(v)<1.9)
    {
     NODE_Y(v)=NODE_Y(v)+(KEY_P-C_P(c0,tc))/C_P_G(c0,tc)[1];
    }
   }
  }
  end_f_loop(f,tf);
}
}