Could not load file or assembly 'Microsoft.IdentityModel

Question

I have developed a SharePoint provider hosted (MVC) app and hosted web application in iis of azure VM (WIN SERVER 2012).

When we try to use application using an app, It throws below error.

Server Error in '/' Application.

Could not load file or assembly 'Microsoft.IdentityModel, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

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.FileNotFoundException: Could not load file or assembly 'Microsoft.IdentityModel, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Assembly Load Trace: The following information can be helpful to determine why the assembly 'Microsoft.IdentityModel, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' could not be loaded.

WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

I have already installed dotNet 3.5 and 4.5 in the server. still having the same error. can anyone help me?

Refurbish

Answer 1

You need Windows Identity Foundation either installed on your server or in your project.

Maddox

In Windows Server 2012, It already carried dotNet 4.5 and 3.5 with OS. So no need to manually install and just we can enable the feature for them. Anyway, thank you for your kind help. – Refurbish

Answer 2

Go to Search – look for Windows feature in Settings

Check the Windows Identity Foundation 3.5 option.

Restart the machine and we are done.

Skillless

Answer 3

Thanks for people who response to me. I could resolve the error. It was the missing assembly in my project.

Refurbish

WHICH assembly? I updated some assemblies and now have a similar problem. – Entomology

Answer 4

It happens because of Broken permissions on file Microsoft.IdentityModel.dll

Solution is;

Add the following 3 entries to %plesk_dir%\etc\DiskSecurity\DiskSecurity.xml file:

<Entry AccounType="1" Account="Psaadm" Path="{ProgramFilesX86}" 
SubPath="Reference Assemblies" AceFlags="ThisFolderSubfoldersAndFiles" 
AccessMask="NoAccess" EntryFlags="0" /> 
<Entry AccounType="1" Account="Psacln" Path="{ProgramFilesX64}" 
SubPath="Reference Assemblies" AceFlags="ThisFolderSubfoldersAndFiles" 
AccessMask="NoAccess" EntryFlags="0" /> 
<Entry AccounType="1" Account="Psaadm" Path="{ProgramFilesX64}" 
SubPath="Reference Assemblies" AceFlags="ThisFolderSubfoldersAndFiles" 
AccessMask="NoAccess" EntryFlags="0" />

below the following entry:

<!-- Program Files\\Reference Assemblies --> 
<Entry AccounType="1" Account="Psacln" Path="{ProgramFilesX86}" 
SubPath="Reference Assemblies" AceFlags="ThisFolderSubfoldersAndFiles" 
AccessMask="NoAccess" EntryFlags="0" />

Edythedythe