I am installing User interface update for SDL Tridion 2011 SP1 on SDL Tridion 2011 SP1 HR2. I installed it administrator and restarted the machine. Now when i try to load CME i am getting following issue.

Could not load file or assembly 'Tridion.Web.UI.Editors.SiteEdit' or one of its dependencies. The system cannot find the file specified.

I had SiteEdit 2009 SP3 on this machine Earlier which i uninstalled first, and after uninstalling and before installing ui-2012 CME was loading perfectly.

  • 1
    Did you stop all (SDL Tridion) services before installing? If not try running repair (with all services stopped). Commented Jul 24, 2013 at 16:33
  • Yes i did, again tried but no luck.
    – Raj Kumar
    Commented Jul 24, 2013 at 16:45

2 Answers 2


Just a FYI, not only does the msi update the files only in the default location (i.e. not the one specified by the user/environmen variables, but the default tridion /web folder) but the .msi also creates the virtual directory paths to all the /Site Edit directories there, so you'll want to update those references as well.

  • Yes, you are right
    – Raj Kumar
    Commented Aug 31, 2013 at 17:39

After analysis i found there is an issue with `UIUpdate2012.msi'. Our tridion web/WebUI directory is on different location from Tridion CM root directory.

but msi copying all the required folders to Tridion CM folder rather than copying to Tridion web/UI.

It Seems msi reading environment variables instead of Windows Registry.

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