firstly, if you make changes to fix this, you have to restart the blade to see the changes and get rid of error.
I cannot tell you what caused the problem, but heres how to fix the error.
Open satyr model up in 3dsmax/maya
select the satyr hair mesh by itself, and hide unselected.
open the materials editor (if in 3dsmax) and rename the material or append a incremented number
and then in Hero Tools Exporter select dynamic character part and export selected.
Overwrite satyrhair01.hgm.
Upload the new file to the server in the repository.
Just a note: for every material you create, make sure no other material will ever use the same name.
you can use the same material on multiple meshes, but cannot have two different materials using the same name. This caused your error.
close the blade, and restart it, the error should be gone.
While it doesnt show the name of the second file, you do know the first, and so renaming the material for that mesh will solve the conflict.
You have two meshes using the same material but one of them has the following:
in material editor under shader options, the shader is set to "hair.fx" and the other is set to "auto select".
You can either fix this so that they both match, or rename the material as i described above, I cant tell you which would be proper without knowing if they're supposed to match or not.
Hope this helps.