Thanks!
[ERROR] [Vulkan]: Failed to load LUT "E:\SteamLibrary\steamapps\common\RetroArch\shaders\Mega_Bezel_Community\Duimon-Mega-Bezel\Graphics\Sanyo_DMC8500_Monitor\DCM8500.png".
[ERROR] [Vulkan]: Failed to create preset: "E:\SteamLibrary\steamapps\common\RetroArch\shaders\Mega_Bezel_Community\Duimon-Mega-Bezel\Presets\Standard\Acorn_Electron\Electron-[STD]-[Guest]-[Monitor]-[Night].slangp".
[ERROR] [Vulkan]: Failed to create filter chain: "E:\SteamLibrary\steamapps\common\RetroArch\shaders\Mega_Bezel_Community\Duimon-Mega-Bezel\Presets\Standard\Acorn_Electron\Electron-[STD]-[Guest]-[Monitor]-[Night].slangp". Falling back to stock.
Looks like Sanyo_DMC8500_Monitor folder is absent in this path below;
shaders\Mega_Bezel_Community\Duimon-Mega-Bezel\Graphics
And this is from Acorn Archimedes log;
[ERROR] [Vulkan]: Failed to load LUT "E:\SteamLibrary\steamapps\common\RetroArch\shaders\Mega_Bezel_Community\Duimon-Mega-Bezel\Graphics\Commodore_1084s\Acorn_AKF11.png".
[ERROR] [Vulkan]: Failed to create preset: "E:\SteamLibrary\steamapps\common\RetroArch\shaders\Mega_Bezel_Community\Duimon-Mega-Bezel\Presets\Standard\Acorn_Archimedes\Archimedes-[STD]-[Guest]-[Monitor]-[Night].slangp".
[ERROR] [Vulkan]: Failed to create filter chain: "E:\SteamLibrary\steamapps\common\RetroArch\shaders\Mega_Bezel_Community\Duimon-Mega-Bezel\Presets\Standard\Acorn_Archimedes\Archimedes-[STD]-[Guest]-[Monitor]-[Night].slangp". Falling back to stock.