proc iml;
use A;
read all into a;
use Fish;
read all into b;
c=a+b;
run;

显示错误：
6495  proc iml;
NOTE: IML Ready
6496  use A;
6497  read all var{col1} into a;
6498  use Fish;
6499  read all var{m1} into b;
6500  c=a+b;
6501  run;
NOTE: Module MAIN is undefined in IML; cannot be RUN.