Could not load type ‘Sitecore.Web.UI.Controls.SheerUI’ on Indexing Manager or Rebuild Link Databases

INTRODUCTION I have just upgraded a client’s website from Sitecore 8.0 to 8.2 Update 4. Then I also installed Web Forms for Marketers WFFM 8.2 Update 4. After the WFFM install somehow the Indexing Manager and Rebuild Link Databases link did not work. It returned 404. The exact error message was: Could not load type […]