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MV Battle Sprites Problem

BMM_Archive · July 15, 2026

BMM_Archive
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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: MV Battle Sprites Problem
  • Original author: richeater
  • Original date: September 4, 2020
  • Source thread: https://forums.rpgmakerweb.com/threads/battle-sprites-problem.126774/
  • Source forum path: Game Development Engines > RPG Maker Javascript Plugins > Javascript/Plugin Support

Summary

I normally wouldn’t post on the forum because I’m shy but I’m actually desperate. I have basically 0 knowledge of JavaScript and can’t solve this by myself. And I don’t know anyone who works in JavaScript! I’m not sure what caused this, but if I run a Battle Test or trigger a battle during Playtest, I cannot use Attack. I can safely use Guard/Escape/any other option, but specifically cannot use Attack (against ANY enemies). I was fine using Attack before and the only change I have made since then is...

Archived First Post

I normally wouldn’t post on the forum because I’m shy but I’m actually desperate. I have basically 0 knowledge of JavaScript and can’t solve this by myself. And I don’t know anyone who works in JavaScript!
I’m not sure what caused this, but if I run a Battle Test or trigger a battle during Playtest, I cannot use Attack. I can safely use Guard/Escape/any other option, but specifically cannot use Attack (against ANY enemies). I was fine using Attack before and the only change I have made since then is installing YEP CoreEngine and adjusting some font settings. I think I can say that the problem is the variable “this”, but I don’t know how to fix it.

Here is the error message I receive when I use Attack during combat:
BUGERRORMESSAGE.png

text:
Game has encountered a bug. Please report it.
TypeError: this.startEffect is not a function
at Sprite_EnemyActor.Sprite_Battler.updateSelectionEffect (YEP_CoreEngine.js:2072:44)
at Sprite_EnemyActor.Sprite_Battler.update (rpg_sprites.js:496:14)
at Sprite_EnemyActor.Sprite_Actor.update (rpg_sprites.js:736:37)
at chrome-extension://odlameecjipmbmbejkplpemijjgpljce/js/rpg_core.js:4068:19
at Array.forEach ()
at Sprite_Enemy.Sprite.update (rpg_core.js:4068:19)
at Sprite_Enemy.Sprite_Base.update (rpg_sprites.js:25:29)
at Sprite_Enemy.Sprite_Battler.update (rpg_sprites.js:491:34)
at Sprite_Enemy.update (HIME_SideviewActorEnemies.js:173:39)
at chrome-extension://odlameecjipmbmbejkplpemijjgpljce/js/rpg_core.js:4068:19
Press F5 to restart the game.

I cannot stress enough that I don’t even know how to begin to fix this so please let me know if further information is needed to help diagnose the problem.

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