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MZ Error message when I open the visustella sample game project with the game testing system.

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: MZ Error message when I open the visustella sample game project with the game testing system.
  • Original author: ikolit
  • Original date: September 2, 2024
  • Source thread: https://forums.rpgmakerweb.com/threads/error-message-when-i-open-the-visustella-sample-game-project-with-the-game-testing-system.171602/
  • Source forum path: Game Development Engines > RPG Maker Javascript Plugins > Javascript/Plugin Support

Summary

I don't know why, but I keep getting this error message when trying to use the game testing system inside RMMZ for the visustella sample game project and any other projects with the plug ins from the sample game (this one https://visustella.itch.io/visumz-sample). I've tried updating the corescript and updating the plug ins separately but it still shows the error when I try to open the game. When trying to use the plug ins from the sample project on my own project, and opening it with the game testing system it...

Archived First Post

I don't know why, but I keep getting this error message when trying to use the game testing system inside RMMZ for the visustella sample game project and any other projects with the plug ins from the sample game (this one https://visustella.itch.io/visumz-sample).

I've tried updating the corescript and updating the plug ins separately but it still shows the error when I try to open the game.

When trying to use the plug ins from the sample project on my own project, and opening it with the game testing system it jumped the start menu all-together and wouldn't show me the title page for the game either.

It doesn't give me the same error when I export the game and run it as a finished project.

1725246464586.png


I'm very new to rpg maker mz, I'm not sure if this is a common error. If anyone knows what is wrong or how to solve it, I would really appreciate it.

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