Solving 2 ASP.Net Run-Time Errors

Sys.Extended is undefined

Firefox Web Developer Toolbar shows the error

Sys.Extended is undefined

If you click Information, View JavaScript, browse through the code and you may find the section for a JavaScript file called


(your codes may differ), containing an error message from ASP.Net that a directory cannot be found.

Solution: add the missing directory, even if it is empty.

Could not load type ‘System.Web.UI.ScriptReferenceBase’

The browser displays the error message:

Error Message: Could not load type ‘System.Web.UI.ScriptReferenceBase’ from assembly ‘System.Web.Extensions, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35’.

Der Typ “System.Web.UI.ScriptReferenceBase” in der Assembly “System.Web.Extensions, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35” konnte nicht geladen werden.

Solution: Install .Net Framework 3.5 Service Pack 1

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