Following is the error we get, while we updated one of the block model, not sure on why EPiServer.Initialization.Internal.ModelSyncInitialization doesnt initialize, Did any one go through this error before? 

Server Error in '/' Application.

The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047)

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.IO.FileLoadException: The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047)

[InitializationException: Initialize action failed for Initialize on class EPiServer.Initialization.Internal.ModelSyncInitialization, EPiServer, Version=11.20.2.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7]
   EPiServer.Framework.Initialization.InitializationEngine.InitializeModules() +482
   EPiServer.Framework.Initialization.InitializationEngine.ExecuteTransition(Boolean continueTransitions) +153
   EPiServer.Framework.Initialization.InitializationEngine.Initialize() +40
   EPiServer.Framework.Initialization.<>c.<FrameworkInitialization>b__7_0(InitializationEngine e) +9
   EPiServer.Framework.Initialization.InitializationModule.EngineExecute(HostType hostType, Action`1 engineAction) +461
   EPiServer.Framework.Initialization.InitializationModule.FrameworkInitialization(HostType hostType) +170
   EPiServer.Global..ctor() +44
   FirstPREMIER.EPiServerApplication..ctor() +42
   ASP.global_asax..ctor() in c:\Users\Local Admin\AppData\Local\Temp\Temporary ASP.NET Files\vs\d0631526\b19775f0\App_global.asax.pnkn-9gg.0.cs:0