Hi Marco,
Is this a bad copy/paste or is the "A" missing in the latest line of emis_list.txt?
The read_emis_file has been designed for Cloudy version 13, now that c17 has 2 more digits, one need to specify the number of digits with:
c_input.read_emis_file('./emis_list.txt', N_char=14)
It should solve your issue. One of these days I should changed the default value to 14 instead of 12..