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When you open a workflow by using the workflow designer in Microsoft Visual Studio 2005, you occasionally receive the following error message:
Error loading workflow
An error occurred while loading the workflow. Please correct the following error and try reloading the document to view the workflow.
The type initializer for 'Microsoft.Practices.PageFlow.WorkflowFoundation.Activities.PageFlow' threw an exception.
Note The workflow designer is a part of the Visual Studio 2005 extensions for the Microsoft .NET Framework 3.0 (Microsoft Windows Workflow Foundation). You must install the workflow designer separately. The workflow designer is not a part of the release version of Visual Studio 2005.
This problem occurs because the TypeResolutionService method sometimes uses the incorrect active project to resolve the types of the workflow in the AppDomain.AssemblyResolve event.
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
To download this hotfix from the MSDN Code Gallery, visit the following Microsoft Web site:
Note The MSDN Code Gallery displays the languages for which the hotfix is available. If you do not see your language listed, it is because the Code Gallery resource page is not available for that language.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
You must have Visual Studio 2005 Service Pack 1 (SP1) and Windows Workflow Foundation installed to apply this hotfix.
You do not have to restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
Visual Studio 2005, x86-based versions
Visual Studio 2005 extensions for Windows Workflow Foundation, x64-based versions
Visual Studio 2005 extensions for Windows Workflow Foundation, x86-based versions
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates