DevExpress 10.1 Assembly missing error

Hi Folks,

I'm using TFS 2013 and have the SharePoint integration set up (SharePoint 2010). Recently I have been unable to access any of my TFS SharePoint sites  as I am getting the error:-

Could not load file or assembly 'DevExpress.Web.v10.1, Version=10.1.4.0,
Culture=neutral, PublicKeyToken=b88d1754d700e49a' or one of its dependencies.
The system cannot find the file specified

It only occurs in the TFS SharePoint sites (such as the project dashboard) and does not occur on any other SharePoint sites.

Does anyone know how to fix this issue?