Common problem, unclear solution

fluka-discuss:

This problem is cited repeatedly on the discussion board:

"Low energy neutron xsec not found for some media"

The solution to this problem, however, is unclear to me. I don't
understand how a material (graphite) I've added from the Flair
database does not have low energy neutron cross-sections properly
associated with it.

Any help in resolving this issue will be helpful since I have other
inputs with an identical problem.

Joel DeWitt
Oklahoma State University
USA