这是我的编程：结果一直显示在转换中使用了未定义变量JC，想向各位前辈问问是怎么回事呢？
USEVARIABLE ARE AJC1 AJC2 AJC3 AJC4 DJC1 DJC2 DJC3 DJC4 DJC5 UJC1 UJC2 UJC3 UJC4  NSF1 NSF2 NSF3 DAF1 DAF2 POF1 POF2 MM1 MM2 MM3 MM4 MM5 MM6 CH1 CH2 CH3 XW;
DEFINE:
XW=JC*WF;
ANALYSIS:
  bootstrap=1000;
MODEL:
  AJC BY AJC1 AJC2 AJC3 AJC4;
  DJC BY DJC1 DJC2 DJC3 DJC4 DJC5;
  UJC BY UJC1 UJC2 UJC3 UJC4;
  JC by AJC DJC UJC;

  NSF BY NSF1 NSF2 NSF3;
  DAF BY DAF1 DAF2;
  POF BY POF1 POF2;
  WF by NSF DAF POF;

  MM BY MM1 MM2 MM3 MM4 MM5 MM6;
  CH BY CH1 CH2 CH3;

  CH ON MM(b1) JC WF XW;
  MM ON JC(a1) WF XW(a3);

MODEL CONSTRAINT:
  new(ind wmodval);
  wmodval=-1;
  ind=(a1+a3*wmodval)*b1;

OUTPUT:STANDARDIZED CINTERVAL(BCBOOTSTRAP);