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Solution for “Could not load type System.Web.UI.ScriptReferenceBase from System.Web.Extensions” error

By , 12/29/2009 3:49 PM

If your ASP.NET application worked fine in your Development environment, but after deploying it to staging or production crashes with error:

Could not load type System.Web.UI.ScriptReferenceBase from System.Web.Extensions

most likely it was compiled against .NET 3.5 SP1 but the target machine has original .NET 3.5 framework without SP1. The solution is download Service Pack 1 and install it on target server. Another possibility – compile the project against original .NET 3.5 framework.

One Response to “Solution for “Could not load type System.Web.UI.ScriptReferenceBase from System.Web.Extensions” error”

  1. Dave Purgason says:

    This cleared the same problem on my development machine.

    Yuriy, I tip my hat to you!

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