# Validation error from outdated files in sys/versions (regression?)

**URL:** <https://forums.unrealengine.com/t/validation-error-from-outdated-files-in-sys-versions-regression/2533332>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, fixed, fortnite\
**Created:** [May 29, 2025, 9:49pm UTC](https://forums.unrealengine.com/t/validation-error-from-outdated-files-in-sys-versions-regression/2533332 "2025-05-29T21:49:15Z")\
**Posts on this page:** 1\
**Showing post:** 45

<div class="post-metadata">

**Author:** ![ItsJacky](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/itsjacky/32/913179_2.png) [@ItsJacky](https://forums.unrealengine.com/u/ItsJacky)\
**Post date:** [June 18, 2025, 11:58am UTC](https://forums.unrealengine.com/t/validation-error-from-outdated-files-in-sys-versions-regression/2533332/45 "2025-06-18T11:58:14Z")

</div>

I’m encountering the Validation Error since the v36.10 update.  
The errors appear to refer to Scene Graph related changes i.e. “\_material”.  
Currently the published island has Scene Graph disabled and have Scene Graph is enabled in project.

Island Code: 2878-0542-7931

```auto
C:/Users/Jacky/Documents/LumberjackSurvivors/Plugins/LumberjackSurvivors/sys/published/Content/Modules/arena_info_ui.verse(49,46, 49,73) : Script error 3506: Unknown member `MI_ArenaPreview_UI_material` in `UI`.
C:/Users/Jacky/Documents/LumberjackSurvivors/Plugins/LumberjackSurvivors/sys/published/Content/Modules/arena_manager.verse(167,42, 167,62) : Script error 3506: Unknown member `M_Tree_Inst_material` in `Materials`.
C:/Users/Jacky/Documents/LumberjackSurvivors/Plugins/LumberjackSurvivors/sys/published/Content/Modules/arena_manager.verse(169,48, 169,72) : Script error 3506: Unknown member `MI_ArenaPreview_material` in `Materials`.
C:/Users/Jacky/Documents/LumberjackSurvivors/Plugins/LumberjackSurvivors/sys/published/Content/Modules/npc_codex_ui.verse(56,46, 56,73) : Script error 3506: Unknown member `MI_ArenaPreview_UI_material` in `UI`.
C:/Users/Jacky/Documents/LumberjackSurvivors/Plugins/LumberjackSurvivors/sys/published/Content/Modules/arena_info_ui.verse(49,89, 49,116) : Script error 3506: Unknown member `MI_ArenaPreview_UI_material` in `UI`.
C:/Users/Jacky/Documents/LumberjackSurvivors/Plugins/LumberjackSurvivors/sys/published/Content/Modules/arena_manager.verse(167,75, 167,95) : Script error 3506: Unknown member `M_Tree_Inst_material` in `Materials`.
C:/Users/Jacky/Documents/LumberjackSurvivors/Plugins/LumberjackSurvivors/sys/published/Content/Modules/arena_manager.verse(169,85, 169,109) : Script error 3506: Unknown member `MI_ArenaPreview_material` in `Materials`.
C:/Users/Jacky/Documents/LumberjackSurvivors/Plugins/LumberjackSurvivors/sys/published/Content/Modules/npc_codex_ui.verse(56,89, 56,116) : Script error 3506: Unknown member `MI_ArenaPreview_UI_material` in `UI`.
C:/Users/Jacky/Documents/LumberjackSurvivors/Plugins/LumberjackSurvivors/sys/published/Content/Modules/item_drop.verse(254,9, 260,1) : Script error 3510: This function returns a value of type material, but the function body's result is an incompatible value of type subtype(material).
C:/Users/Jacky/Documents/LumberjackSurvivors/Plugins/LumberjackSurvivors/sys/published/Content/Modules/arena_info_ui.verse(33,38, 33,57) : Script error 3509: This variable expects to be initialized with a value of type material, but this initializer is an incompatible value of type type(M_GradientCircle_UI, M_GradientCircle_UI).
C:/Users/Jacky/Documents/LumberjackSurvivors/Plugins/LumberjackSurvivors/sys/published/Content/Modules/game_progress_bar_ui.verse(62,38, 62,52) : Script error 3509: This variable expects to be initialized with a value of type material, but this initializer is an incompatible value of type type(M_BossIcon_MPC, M_BossIcon_MPC).
C:/Users/Jacky/Documents/LumberjackSurvivors/Plugins/LumberjackSurvivors/sys/published/Content/Modules/npc_codex_ui.verse(22,38, 22,65) : Script error 3506: Unknown member `MI_ArenaPreview_UI_material` in `UI`.

```

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