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TyperError when trying to Playtest.

BMM Archive · July 15, 2026

Preserved forum archive. This topic stores the original first post and locally mirrored RPG Maker Web attachments when available. It is posted by the BMMPlay archive account, not by the original creator.

Original Source

  • Original title: TyperError when trying to Playtest.
  • Original author: Little Adventurer
  • Original date: March 4, 2016
  • Source thread: https://forums.rpgmakerweb.com/threads/typererror-when-trying-to-playtest.57909/
  • Source forum path: Game Development Engines > Legacy Engine Support > RPG Maker MV Support

Summary

I tried out the ItemBook and EnemyBook plugins recently in a new project. I was able to have it work fine with my test project, however, I've run into an issue with the ItemBook plugin. If active, it gives me a TypeError of "cannot read property of '0' undefined". I found this strange as, if you'll observe the first and second pictures (the first is from my test project, the second is from my current project), I did my event almost exactly the same, save for no sound effects. Yes,...

Archived First Post

I tried out the ItemBook and EnemyBook plugins recently in a new project. I was able to have it work fine with my test project, however, I've run into an issue with the ItemBook plugin.


If active, it gives me a TypeError of "cannot read property of '0' undefined". I found this strange as, if you'll observe the first and second pictures (the first is from my test project, the second is from my current project), I did my event almost exactly the same, save for no sound effects. Yes, I updated it to 1.01 as per Yanfly's instructions. Yes, I upgraded to the new version of MV, but this was happening BEFORE that, so it's not that update. I checked my items (I used to have an item equivalent of both but got rid of it), my variables, my common events, my Main Manager plugin from Yanfly, my switches and self switches... None of those have any trace of that plugin whatsoever.


Please help me solve this conundrum!

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Referenced Images / Attachments

Screenshot 2016-03-03 23.25.44.png
Screenshot 2016-03-03 23.25.44.png
Screenshot 2016-03-03 23.25.11.png
Screenshot 2016-03-03 23.25.11.png
Screenshot 2016-03-03 23.25.04.png
Screenshot 2016-03-03 23.25.04.png
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#039#rpg-maker-archive#mv-support

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