输入命令
forvalues c=2/5{
  2. lclogit y location camera album microphone maillist calendar money,
  3.  group(gid) id(pid) nclasses(`c') membership(_x1) seed(1234567890)
  4.  matrix b = e(b)
  5. matrix ic = nullmat(ic）\ `e(nclasses)',`e(ll)',`=colsof(b)',
  6.  `e(caic)',`e(bic)'
  7. }
option id() required
r(198);
一直报错
请问这个问题要怎么解决呢？