How exactly did you add the new league?
I'm guessing that something in how it was added, there's still games on the schedule that somehow reference teams in the second subleague, the one that was deleted. So maybe if you added and deleted teams, there's still games that reference those deleted teams?
I would expect that clearing and regenerating the schedule should fix the problems, but without knowing exactly how the new league and schedule were added, it's hard to say exactly where things first went wrong.
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