Quick tip: if you have this error, then you”ve got the wrong name for your assembly in the xmlns namespace introduced on the xaml file. Quick example:


Notice the ClentBin (instead of ClientBin) typo…


~ by Luis Abreu on July 23, 2007.

4 Responses to “Silverlight: the AG_E_RUNTIME_MANAGED_ASSEMBLY_DOWNLOAD error”

  1. Heya,

    Any idea why this would be an issue only in some browsers? I have an application that works fine in IE, but throws this error in Firefox. I”ve double checked the assembly path and it looks good.

  2. I had this problem and it was because i had a space in my project name “Silverlight Overview”. It was creating a “Silverlight Overview” dll file but the dll being referenced in the Page.xaml was “Silverlight_Overview” (notice the underscore?).

    If I changed the dll file to use an underscore instead of a space it worked but of course screwed up my Visual Studio 2006 project files. So I recreated the Project as “SilverlightOverview” and it worked fine.

    It”s alpha software for a reason I guess 🙂

  3. Kevin: try to add width and height attribute, I have the same problem and i notice that firefox dosn”t display canvas without height atribute.

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