[modeller_usage] help--model_ini.py

Hi: My initial model is one chain, I use model_ini.py scripts to build model, and edit my alignment file to add a starting residue number, such as: sequence:bhro:1::348:::::0.00:0.00 it also appears errors: rdpdb___303E> No atoms were read from the specified input PDB file, since the starting residue number and/or chain id in MODEL_SEGMENT (or the alignment file header) was not found; requested starting position: residue number " ", chain " " now, how does MODELLER solve it? thank you!