problem in stage 5 (train BRs for mid-level biased agents)

I got stuck in stage 5: (train BRs for mid-level biased agents) when running the command: bash shell/train_bias_agents_br.sh random0 inside the train_bias_agents_br, In the .sh file, on line 30, it expects to find a file from which it can extract n, but this file doesn’t exist on my station, despite successfully completing all previous stages. Is it possible to get your help in the matter?