Unable to open file for input.
#3019 Non-recoverable error
Unable to open file for input.
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.