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Error message when you install the .NET Framework 3.5 SP1 on a computer that is running Windows SharePoint Services 2.0: "A Web Part or Web Form Control on this Web Part Page cannot be displayed or imported"
Article ID: 957254 - View products that this article applies to.
If you install the .NET Framework 3.5 Service Pack 1 (SP1) on a computer that is running Windows SharePoint Services 2.0, every Web part in Windows SharePoint Services 2.0 displays the following error message:
Additionally, the following event may be logged in the Application log:
Web Part Error: A Web Part or Web Form Control on this Web Part Page cannot be displayed or imported because it is not registered on this site as safe.
Note The .NET Framework 3.5 SP1 is included in Microsoft Visual Studio 2008 Service Pack 1 (SP1). Therefore, this problem also occurs when Visual Studio 2008 SP1 is installed on a computer that is running Windows SharePoint Services 2.0.
Event ID: 1000
Error initializing Safe control - Assembly: Microsoft.SharePoint, Version=220.127.116.11, Culture=neutral, PublicKeyToken=71e9bce111e9429c TypeName: * Namespace: Microsoft.SharePoint.SoapServer Error: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
For more information, see Help and Support Center at http://www.microsoft.com/technet/support/ee/ee_basic.aspx
To work around this issue, uninstall the following programs:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.