Unable to load plugin 'OnlineSubsystemSteam'

Log file open, 03/29/21 00:20:27
LogInit: Display: Running engine for game: Multigame
LogInit: Display: Project file not found: …/…/…/Multigame/Multigame.uproject
LogInit: Display: Attempting to find via project info helper.
LogUProjectInfo: Found projects:
LogPakFile: Display: Found Pak file …/…/…/Multigame/Content/Paks/Multigame-WindowsNoEditor.pak attempting to mount.
LogPakFile: Display: Mounting pak file …/…/…/Multigame/Content/Paks/Multigame-WindowsNoEditor.pak.
LogPlatformFile: Not using cached read wrapper
LogTaskGraph: Started task graph with 5 named threads and 11 total threads with 3 sets of task threads.
LogStats: Stats thread started at 0.130568
LogD3D11RHI: Loaded GFSDK_Aftermath_Lib.x64.dll
LogICUInternationalization: ICU TimeZone Detection - Raw Offset: +3:00, Platform Override: ‘’
LogPluginManager: Error: Unable to load plugin ‘OnlineSubsystemSteam’. Aborting.
LogCore: Engine exit requested (reason: EngineExit() was called)
LogExit: Preparing to exit.
LogModuleManager: Shutting down and abandoning module RenderCore (30)
LogModuleManager: Shutting down and abandoning module Landscape (28)
LogModuleManager: Shutting down and abandoning module SlateRHIRenderer (26)
LogModuleManager: Shutting down and abandoning module OpenGLDrv (24)
LogModuleManager: Shutting down and abandoning module D3D11RHI (22)
LogModuleManager: Shutting down and abandoning module AnimGraphRuntime (20)
LogModuleManager: Shutting down and abandoning module Renderer (18)
LogModuleManager: Shutting down and abandoning module Engine (16)
LogModuleManager: Shutting down and abandoning module CoreUObject (14)
LogModuleManager: Shutting down and abandoning module NetworkFile (12)
LogModuleManager: Shutting down and abandoning module CookedIterativeFile (10)
LogModuleManager: Shutting down and abandoning module StreamingFile (8)
LogModuleManager: Shutting down and abandoning module SandboxFile (6)
LogModuleManager: Shutting down and abandoning module PakFile (4)
LogModuleManager: Shutting down and abandoning module RSA (3)
LogExit: Exiting.
Log file closed, 03/29/21 00:20:27

Why can I get the error Unable to load plugin ‘OnlineSubsystemSteam’

Hm, this is interesting. I don’t have an answer but I hope someone can.