Unable to open file for output.
          #3024   Non-recoverable error
          Unable to open file for output.
Additional Information
 File is 'X'.
     where X is the name of the file.
Explanation
The host operating system reported a failure when instructed to
open a file.
There are several causes of this error.  Among them, a non-existent
path name might have been specified,
the disk could be full,
or too many files are currently open.