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Yanfly BattleCore: TypeError undefined is not a function

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: Yanfly BattleCore: TypeError undefined is not a function
  • Original author: Ghostsniper64
  • Original date: September 25, 2016
  • Source thread: https://forums.rpgmakerweb.com/threads/yanfly-battlecore-typeerror-undefined-is-not-a-function.68833/
  • Source forum path: Game Development Engines > Legacy Engine Support > RPG Maker MV Support

Summary

Hey guys, I've been working on the battle system end of my game and I opted to go with Yanfly's Battle engine core v1.39b. Unfortunately I've encountered a problem relatively early on, which I see this error at the beginning of the player team's second turn. I've tried disabling all other plugins other than the battle core, but to no avail. Any suggestions? Edit: also my current game version is 1.31.   {

Archived First Post

Hey guys, I've been working on the battle system end of my game and I opted to go with Yanfly's Battle engine core v1.39b. Unfortunately I've encountered a problem relatively early on, which I see this error at the beginning of the player team's second turn. I've tried disabling all other plugins other than the battle core, but to no avail. Any suggestions?
Edit: also my current game version is 1.31.
 


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