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Asked: 2026-05-18T08:28:54+00:00

I have a really odd 2104 error occurring when I am hosting a Silverlight

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I have a really odd 2104 error occurring when I am hosting a Silverlight control in my MVC site.

If I go to http://mywebsite.com/SomeController then the Silverlight application will load correctly.
However, if I go to http://mywebsite.com/SomeController/Index then it fails to load and I get the 2104 error. I tried to change the Action name to something other than index, but still no luck.

Right now, it’s just boilerplate Silverlight control code, but I need to add some initParams to it, so I need my action to look like http://mywebsite.com/SomeController/Index/1/2

Does anyone have any ideas on what could be causing this?

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  1. Editorial Team

    Code 2104 is “Could not download the Silverlight application. Check web server settings”.
    List of codes are here.

    You are likely using a relative URL for your silverlight object, which doesn’t resolve correctly if you are in a subdirectory.

    Use the tilde syntax to correctly point to your silverlight object:

    <param name="source" value="<% = Url.Content("~/ClientBin/MySilverlightThing.xap") %>"/>
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