I’m currently having this issue and been having it for a while. I followed the steps on other occasions too and gave up a few times. I added one mod “MCCC” so that I could get an error report this time. I added the info below to see if that helps.
MC Command Center Last Exception Report
Important MCCC Links
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OS: Darwin 20.6.0 - Darwin Kernel Version 20.6.0: Thu Jul 6 22:12:47 PDT 2023; root:xnu-7195.141.49.702.12~1/RELEASE_X86_64 Sims 4 Version: 1.109.185.1230
Sims 4 Add-On Details (Click to expand/collapse) MCCC Version Details (Click to expand/collapse) Full Mod List (Click to expand/collapse) Population Details (Click to expand/collapse) MC Command Center Last Exception Sep 19 - 01:27:27 Summary
- Last Module Called: T:\InGame\Gameplay\Scripts\Server\buffs\appearance_modifier\appearance_tracker.py
- Last Function Called: evaluate_appearance_modifiers
- Error message: Exception in Sim Timeline: Exception running Element (AttributeError: 'MergingAppearanceModifier' object has no attribute 'should_refresh_thumbnail'), CategoryID: T:\InGame\Gameplay\Scripts\Server\buffs\appearance_modifier\appearance_tracker:212
Sim Info (Click to expand/collapse) Pretty Error CallStack (Click to expand/collapse) Full Error CallStack (Click to expand/collapse) MC Command Center Last Exception Sep 19 - 01:37:24 Summary
- Last Module Called: T:\InGame\Gameplay\Scripts\Server\buffs\appearance_modifier\appearance_tracker.py
- Last Function Called: evaluate_appearance_modifiers
- Error message: Exception in Sim Timeline: Exception running Element (AttributeError: 'MergingAppearanceModifier' object has no attribute 'should_refresh_thumbnail'), CategoryID: T:\InGame\Gameplay\Scripts\Server\buffs\appearance_modifier\appearance_tracker:212
Sim Info (Click to expand/collapse) Pretty Error CallStack (Click to expand/collapse) Full Error CallStack (Click to expand/collapse) MC Command Center Last Exception Sep 19 - 01:37:39 Summary
- Last Module Called: T:\InGame\Gameplay\Scripts\Server\buffs\appearance_modifier\appearance_tracker.py
- Last Function Called: evaluate_appearance_modifiers
- Error message: Exception in Sim Timeline: Exception running Element (AttributeError: 'MergingAppearanceModifier' object has no attribute 'should_refresh_thumbnail'), CategoryID: T:\InGame\Gameplay\Scripts\Server\buffs\appearance_modifier\appearance_tracker:212
Sim Info (Click to expand/collapse) Pretty Error CallStack (Click to expand/collapse) Full Error CallStack (Click to expand/collapse) MC Command Center Last Exception Sep 19 - 01:38:50 Summary
- Last Module Called: T:\InGame\Gameplay\Scripts\Server\buffs\appearance_modifier\appearance_tracker.py
- Last Function Called: evaluate_appearance_modifiers
- Error message: Sim Emi Fujita failed to add buff NateTheL0ser_PrivatePracticeAllergens_SomethingInTheAir from state. Commodity:Commodity(NateTheL0ser_PrivatePracticeAllergens_AllergictoLeafMold/2408667012@0.0), Sim LOD:SimInfoLODLevel.BACKGROUND (AttributeError: 'MergingAppearanceModifier' object has no attribute 'should_refresh_thumbnail'), CategoryID: T:\InGame\Gameplay\Scripts\Server\buffs\appearance_modifier\appearance_tracker:212
Sim Info (Click to expand/collapse) Pretty Error CallStack (Click to expand/collapse) Full Error CallStack (Click to expand/collapse) MC Command Center Last Exception Sep 19 - 01:40:17 Summary
- Last Module Called: T:\InGame\Gameplay\Scripts\Server\buffs\appearance_modifier\appearance_tracker.py
- Last Function Called: evaluate_appearance_modifiers
- Error message: Exception in Sim Timeline: Exception running Element (AttributeError: 'MergingAppearanceModifier' object has no attribute 'should_refresh_thumbnail'), CategoryID: T:\InGame\Gameplay\Scripts\Server\buffs\appearance_modifier\appearance_tracker:212
Sim Info (Click to expand/collapse) Pretty Error CallStack (Click to expand/collapse) Full Error CallStack (Click to expand/collapse)