UID_OPEN

 SEVERE:  The compiler could not create the UID  file  noted  in  the
 message.    A   UID   file   holds   the   compiled  user  interface
 specification.

 USER ACTION:  Check that you have write access to the directory  you
 specified  to  hold  the  UID  file.   If you have a large number of
 source and include files, check that you have not exceeded your open
 file quota.