SELECT ndbf22
   COPY TO ykgl\yktemp\nYklh221
   SELECT 0
   USE nYklh221.dbf EXCLUSIVE
   INDEX ON ubh+ubh2+ubh3 TAG umc ADDITIVE
   SET ORDER TO umc
   GO TOP
   TOTAL ON umc TO ykgl\yktemp\nYklh221tj.dbf FIEL sl_c,je_inc,je_outc
   USE nYklh221tj.dbf EXCLUSIVE
运行后总是出错，说：找不到变量'umc',请问师傅，错在哪里？？？
附图：