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Error: [file or assembly Microsoft.Practices.EnterpriseLibrary.Validation or one of its dependencies not found]

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Exclaimer Support
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Relevant Product: Signature Manager Exchange Edition

WARNING! The following product was discontinued on 1st April 2021 and is no longer available for purchase or support:

  •  Mail Disclaimers

For more information, please see the Discontinued Questions and Answers page.

WARNING! The following products were discontinued on 30 September 2022:

- Exclaimer Signature Manager Outlook Edition

- Exclaimer Signature Manager Exchange Edition
 

The end of Support for these products is 30th September 2024.

For more information, please see the Discontinued Questions and Answers page.

Scenario 

You are using Exclaimer Signature Manager Exchange Edition and you notice that emails are delivered without a signature appended. In the Exclaimer event log, the following message is observed when processing the emails:

ERROR: Processing Submitted Message: From sender Information: Message recipients: Error: The file or assembly "Microsoft.Practices.EnterpriseLibrary.Validation, Version = 5.0.414.0, Culture = neutral, PublicKeyToken = 31bf3856ad364e35" or one of its dependencies not found. The manifest definition found the assembly does not match the assembly reference. (Exception from HRESULT: 0x80131040) Information: System.IO.FileLoadException: load file or assembly "Microsoft.Practices.EnterpriseLibrary.Validation, Version = 5.0.414.0, Culture = neutral, PublicKeyToken = 31bf3856ad364e35" or one of its dependencies not found. The manifest definition found the assembly does not match the assembly reference. (Exception from HRESULT: 0x80131040) Filename: "Microsoft.Practices.EnterpriseLibrary.Validation, Version = 5.0.414.0, Culture = neutral, PublicKeyToken = 31bf3856ad364e35"

Resolution

To resolve this issue:

  1. Install the Enterprise Library from Microsoft (click here to download).

  2. Using GacUtil, install the Microsoft.Practices.EnterpriseLibrary.Validation.dll into the GAC (GACUtil can be found in the Microsoft Windows SDK. Further details and download links are available from Microsoft, here).

  3. Browse to %ProgramData%\Exclaimer Ltd\Mail Disclaimers\Config2.

  4. Take a backup copy of the CategorizerSettings.config file.

  5. Using Notepad, open the original CategorizerSettings.config file.

  6. Delete the following entry from the configuration file:
    <add type="Exclaimer.DirectoryServices.NoOpBackingStore, Exclaimer.DirectoryServices" name="NoOpBackingStore" />
  7. Open the Windows Services Management console (run services.msc) and locate the Exclaimer Signature Manager Exchange Edition Configuration service.

  8. Save and close the file.

  9. Restart the Exclaimer Signature Manager Exchange Edition Configuration service.