Library /sys$common/syshlp/basichelp.hlb Compile time errors, LOOINDMUS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  ERROR - A FOR statement  specifies  a  string  variable  as  the  loop
  control  variable.   Specify  a  numeric  variable.   You can use only
  numeric variables as loop control variables.