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Have you recompiled your PBS files? You can hold CTRL as the game boots to force it to recompile everything. I think perhaps the messages data file probably got rearranged when items added "plural names" to them, and thus what was the item names is now trainer names.
Are you using a language file? The message sections were rearranged a bit in v13, which would lead to an error like this if you were using an old language file. Yet another reason to read the change logs of any updates you're using.