xtdpdsys linc state_of_worker state_of_hukou sex age1 age2 d,lags(1) maxldep(
> 4) twostep vce(robust)
note: state_of_worker dropped from div() because of collinearity
note: state_of_hukou dropped from div() because of collinearity
note: sex dropped from div() because of collinearity
                     J():  3900  unable to allocate real <tmp>[1109520,338]
         _xtdpd_dowork():     -  function returned error
                 <istmt>:     -  function returned error
请哪位达人知道程序出现以上问题怎么解决，万分感谢