At a guess, I would say the atom list in the cif file is not suitable:
Mg 0.00000 0.00000 0.00000 0.66667
Al 0.00000 0.00000 0.00000 0.33333
O1 0.00000 0.00000 0.37710 1.00000
H1 0.00000 0.00000 0.41440 1.00000
C 0.00000 0.00000 0.16700 0.08333
O2 0.09200 -0.09200 0.50000 0.08333
Wat 0.09200 -0.09200 0.50000 0.08333
Wat is not a recognized element and occupies the same position as O2.
Partial occupancies are also not supported in atoms.
If I change occupancies to 1.00000, and delete the Mg and Wat lines, the file reads in to
and runs in atoms without issue. One would then have to manually modify the feff input to
have the partial occupancies.
-R.