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This article applies to: MultiStore

Configuration Error: Could not load file or assembly 'System.Web.Abstractions'


Symptoms
When accessing a MultiStore 9.1.0.1+ site, a configuration error occurs:

Parser Error Message: Could not load file or assembly 'System.Web.Abstractions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

Cause
The Microsoft .NET Framework 3.5 Service Pack 1 is not installed on the server.

Solution
Install Microsoft .NET Framework 3.5 Service Pack 1 on your server. If the site is hosted, please contact your server host to verify and perform the update, or move the site to an updated server.