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

  ERROR - The  program  attempts  matrix  division.   The  operation  is
  treated  as a MAT multiply, and the compilation continues.  Remove the
  attempted matrix division.  BASIC does not support this operation.