CONTROL_CHAR

 ERROR:  The compiler encountered a illegal control character in  the
 specification  file.   The  decimal  value of the character is given
 between the \ \ characters.

 USER ACTION:  Replace the character with the sequence  specified  in
 the  message  (for  example, \3\ if the control character's internal
 value is 3).  UIL provides several built-in control characters  such
 as  \n  and  \r  for  newline and carriage return.  Consult the "VMS
 DECwindows User Interface Language Reference Manual" for a  complete
 list of supported escape sequences.