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TyperError when trying to Playtest.

BMM_Archive · July 15, 2026

BMM_Archive
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!

Screenshot 2016-03-03 23.25.44.png

Screenshot 2016-03-03 23.25.11.png

Screenshot 2016-03-03 23.25.04.png

Downloads / Referenced Files

RPG Maker Web attachments are mirrored locally when available. Other external links remain hosted by their original creator or third-party service.

  • Local mirror: 19154-36ddd867042c9819a3cd6243d782f0d9.png
    SHA-256: 1ebdf98612c29b75621b7cf5e99965f980abcaec6446fcac5645f9e7145f68be
    Original attachment URL: https://forums.rpgmakerweb.com/attachments/screenshot-2016-03-03-23-25-44-png.32920/
  • Local mirror: 19155-b8c02a0de43bdc705471cdcc1df6b20d.png
    SHA-256: 2808567907aca4e5d5e437c26f780634fd9f4921b903ef710d7bcd226a3ac612
    Original attachment URL: https://forums.rpgmakerweb.com/attachments/screenshot-2016-03-03-23-25-11-png.32921/
  • Local mirror: 19156-166d43f8650f1e368ad93e100b15fcbb.png
    SHA-256: 1e6ef838ee412e28cb782b4c5bcf61bd3d925806f18f11b0d120adb0420a60a7
    Original attachment URL: https://forums.rpgmakerweb.com/attachments/screenshot-2016-03-03-23-25-04-png.32922/

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
Creator Claims / Removal

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