用STATA 11在合并数据的时候用如下命令，
merge 1:1 var1  var2 var3 using "……"

可是返回错误值
(pathsplit() in lmatabase, compiled by Stata 11.2, is too new to be run by
this version of Stata and so was ignored)
          fullfilename():  3499  pathsplit() not found
                 <istmt>:     -  function returned error
r(3499);

请教各位，这是怎么回事啊。。。折腾快两天了，也换过STATA10 来做，还是没用啊。。。各位大侠，求助求助！！！！