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Futokoro's skill upgrade window plugin - Error

BMM_Archive · July 15, 2026

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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: Futokoro's skill upgrade window plugin - Error
Original author: Naridar
Original date: April 20, 2017
Source thread: https://forums.rpgmakerweb.com/threads/futokoros-skill-upgrade-window-plugin-error.77604/
Source forum path: Game Development Engines > RPG Maker Javascript Plugins > Javascript/Plugin Support

Summary

Archived First Post

Hi everyone! I'm posting in case anyone dabbles in japanese plugins, because as far as I've seen, Futokoro's plugins haven't been posted on these forums, or any english-speaking one. Here you can check out the plugins in question. Beware, it's almost completely in japanese.

https://github.com/futokoro/RPGMaker

However, when installing his skill upgrade system, which requires 4 plugins:

FTKR_SkillExpansion 1.3.3
FTKR_SEP_ShowSkillStatus 1.4.2
FTKR_SkillUpgradeSystem_Core 1.4.0
FTKR_SkillUpgradeSystem_Window 1.4.0

Opening the skill menu in-game and pressing confirm on the skill type selection screen, however, crashes the game with an error message:

Code:

TypeError: Cannot read property 'count' of undefined
    at Window_SepTypeList.Window_Base.setSepSkillStatusParams (file:///K:/Users/Bence-win64/Dropbox/Grand%20Triumph%20Theory/js/plugins/FTKR_SkillUpgradeSystem_Window.js:864:10)
    at Window_SepTypeList.Window_Base.drawSepSkillStatus (file:///K:/Users/Bence-win64/Dropbox/Grand%20Triumph%20Theory/js/plugins/FTKR_SEP_ShowSkillStatus.js:1384:21)
    at Window_SepTypeList.drawSkillStatus (file:///K:/Users/Bence-win64/Dropbox/Grand%20Triumph%20Theory/js/plugins/FTKR_SkillUpgradeSystem_Window.js:1193:10)
    at Window_SepTypeList.drawItem (file:///K:/Users/Bence-win64/Dropbox/Grand%20Triumph%20Theory/js/plugins/FTKR_SEP_ShowSkillStatus.js:2098:10)
    at Window_SepTypeList.Window_Selectable.drawAllItems (file:///K:/Users/Bence-win64/Dropbox/Grand%20Triumph%20Theory/js/rpg_windows.js:1250:18)
    at Window_SepTypeList.refresh (file:///K:/Users/Bence-win64/Dropbox/Grand%20Triumph%20Theory/js/plugins/FTKR_SEP_ShowSkillStatus.js:2134:8)
    at Window_SepTypeList.setSkillId (file:///K:/Users/Bence-win64/Dropbox/Grand%20Triumph%20Theory/js/plugins/FTKR_SEP_ShowSkillStatus.js:2326:8)
    at Window_SkillList.update (file:///K:/Users/Bence-win64/Dropbox/Grand%20Triumph%20Theory/js/plugins/FTKR_SEP_ShowSkillStatus.js:1924:54)
    at file:///K:/Users/Bence-win64/Dropbox/Grand%20Triumph%20Theory/js/rpg_core.js:5745:19
    at Array.forEach (native)

This happens even after disabling every other plugin, to rule out incompatibility issues. Also adding the optional plugins mentioned in these 4 (CustomSimpleActorStatus and DisplayCommandFrame) doesn't change this, either. Does someone have any advice or solution? Thanks in advance.

EDIT: The issue is definitely in SkillUpgradeSystem_Window. Disabling it makes the error stop, however, it also defeats the purpose of the plugin.

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