[Nek5000-users] Genmap Error?

[nek5000-users at lists.mcs.anl.gov]

Hello,
I created a ".re2" mesh by converting an Exodus (".exo") mesh from Cubit 
15.0 using the "exo2nek" script. It's a relatively large mesh (780k 
elements) and I need to run it using parallel processing, and so I 
wanted to use the "genmap" script.

However, I keep getting these errors, no matter what input mesh 
tolerance value I use, from 0.2 to 0.00001):

genmap
Input .rea / .re2 name:
RCF_3D_FullSimple
  reading RCF_3D_FullSimple.re2
Input mesh tolerance (default 0.2):
NOTE: smaller is better, but generous is more forgiving for bad meshes.
0.00001
  reading mesh data ...
  start locglob_lexico:           8      775728     6205824 
1.0000000000000001E-005
  locglob:           1           1     6205824
  locglob:           2       11290     6205824
  locglob:           3       15413     6205824
  locglob:           1      632909     6205824
  locglob:           2      632909     6205824
  locglob:           3      632909     6205824
  locglob:           1      632909     6205824
  locglob:           2      632909     6205824
  locglob:           3      632909     6205824

593741     2     4  Matrix:  SELF!!
        1 SELF!!   313837   313837   313837   313837
        2 SELF!!   313837   313837   313837   313837
  cont: SELF!!      593741

  ABORT: SELF-CHK            1           2      593741           0
  Try to tighten the mesh tolerance!

            0  quit


Do you have any idea what this means? Just from the output, it looks 
like it's saying there are coincident vertices or elements? Is it a 
problem with my mesh or with running the script?

Thanks,
Matt