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Silverlight 5 & SMF 2.6


Hi Guys
I cant get Silverlight 5 to work with SMF 2.6. Below is the error message I get
Could not load file or assembly 'System.ComponentModel.Composition, Version=
Note: If I remove the SMF 2.6 control my Silverlight application work fine.

file attachments


tkreyche wrote Jan 5, 2012 at 4:19 PM

I have the same problem - looks like a bug to me!

Setup: Visual Studio 2010 with SP1, with SMF 2.6 installed from msi package, Silverlight 5.
Set references to Microsoft.SilverlightMediaFramework.Core, Plugins, Utilities
If you don't also set a reference to System.ComponentModel.Composition, you will get an initialization error. However after you set it, everything looks good but a video in the Playlist will never play. It will work fine in Silverlight 4.

thanks, Tom

tkreyche wrote Jan 5, 2012 at 4:30 PM

This looks like the same problem reported in

tkreyche wrote Jan 5, 2012 at 4:38 PM

You can easily reproduce the problem by using the environment desribed above, and then following the instructions at

wrote Feb 1, 2012 at 5:11 PM

wrote Feb 10, 2012 at 2:49 AM

wrote Feb 10, 2012 at 2:50 AM

wrote Feb 22, 2013 at 1:33 AM

wrote May 16, 2013 at 12:48 PM

wrote May 16, 2013 at 12:48 PM

wrote Jun 14, 2013 at 8:32 AM

wrote Nov 5, 2015 at 10:49 PM

galgitron wrote Nov 5, 2015 at 10:50 PM

Why is this marked resolved? I have this exact issue and I've tried everything suggested to get the video to play, but it just won't. Visual Studio 2013, latest SMF libs and latest Microsoft.Web.Media.SmoothStreaming.dll 2.0.0. Code attached

Tried everything from

If nobody can offer a fix, I'd really like to revert to the prior version of SMF because I've see it working. I just can't locate the DLLs. This is some of the older syntax

Anybody know how to get an older version?