I've been messing with this case for a while and I am not seeing the error. I don't have any zones defined and I am getting many zone errors.
Can you run this case in FDS 6.7.6 without error? I've tried from PyroSim and the Command Line and still get errors like this...
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 1 meets ZONE 0 at the boundary of MESH 1 and MESH 3
ERROR: ZONE 39 meets ZONE 0 at the boundary of MESH 4 and MESH 1
ERROR: ZONE 34 meets ZONE 0 at the boundary of MESH 4 and MESH 2