Asking for help, having problems at mod

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I'm working on a map mod. Referring to the information provided by "Artifex", thank him. An error occurred while using the tool BOB. The wrong data is "Process start POS (jap_shogun)". The information provided by BOB is as follows:

Failed to save startpos.esf in e:/steam/steamapps/common/total war shogun 2/modding/working_data/campaigns/jap_shogun/!
Failed to save poi.esf in e:/steam/steamapps/common/total war shogun 2/modding/working_data/campaign_maps/sho_japan/!
Failed to save sea_grids.esf in e:/steam/steamapps/common/total war shogun 2/modding/working_data/campaign_maps/sho_japan/!
=====================================
Duration: 6 sec(s)

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4) If Bob is unable to create a new startpos use TWeak to assign the new regions to another campaign. This will cause Bob to treat the new regions as if they were empty regions, making it easier to find which regions are causing Bob to stop working.

I don't understand this sentence. Who can explain it? Thank you.