The program is unable to create a reduction file as specified.
The most probable causes of this are that the target directory does not exist or that the target directory is protected against write access.
Use "ls" to check for each of these conditions:
% ls
to verify that the target directory exists, and
% ls -alF ../name-of-directory
to see what access rights you have.
If you own the directory in which file creation was attempted and have the required access rights then the most probable causes are either that you have run out of disk space or filled your allocation of disk space.
Use "df" to check how much of the target disk is unused:
% df
and "quota" to check that you have not used up your allocation
% quota
You may find that the "quota" command is not available in your path: ask your system manager if you are uncertain how to check your own disk quotas.
Martin Clayton