As I replied in HC, I fear that "gosolo" command screws the battle flags, as player is human, then you type "gosolo", which means that previously human player is now AI, and triggers like BU/BM/BG/BF will generate error if AI only battles. Maybe Bersy or others know better what succeeds when all players are suddenly AI?

Those triggers are 3.58 addition, this is why your gosolo worked with 3.55. Maybe if you delete all flags &1000 from scripts, error will be gone, but probably there is a reason those flags were set.