[modeller_usage] help--model_ini.py

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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!