Did you recreate the files using the updated recommendation:
# Requires NCO package and ncgen.
# Get the first fire location from a stack group file as a template
ncks -a -dROW,0 /path/to/existing/ptfire_stack_group_file.nc -o stack_group_one_fire.nc
# Get the first (same) fire location from an inlin emission file as a template
ncks -a -dROW,0 /path/toexisting/ptfire_inline_file.nc -o inline_one_fire.nc
ncdump stack_group_one_fire.nc > stack_group_one_fire.cdl
ncdump inline_one_fire.nc > inline_one_fire.cdl