Dear Davide,
Did you change this aeroacoustics example in some way? I can’t find AF00od1_Coords.txt in the IEA_LB_RWT-AeroAcoustics example.
The BL_file keyword is needed in the airfoil data file when aeroacoustics is enabled in AeroDyn (CompAA = True). Are you trying to run a simulation with aeroacoustics enabled?
Best regards,