VMS Help UIL, Compile Time Errors, NO_UID  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  INFORMATIONAL:  If the compiler reported error or severe diagnostics
  (that  is,  any of the diagnostic abbreviations starting with %UIL-E
  or %UIL-F), a UID file is not created.  This diagnostic informs  you
  that the compiler did not produce a UID file.

  USER ACTION:  Fix the problems reported by the compiler.