Microsoft KB Archive/936123

= FIX: Error message when you open a workflow by using the workflow designer in Visual Studio 2005: &quot;Error loading workflow&quot; =

Article ID: 936123

Article Last Modified on 10/19/2007

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APPLIES TO


 * Windows Workflow Foundation
 * Microsoft Visual Studio 2005 Team Edition for Software Architects
 * Microsoft Visual Studio 2005 Team Edition for Software Developers
 * Microsoft Visual Studio 2005 Team Edition for Software Testers
 * Microsoft Visual Studio 2005 Service Pack 1
 * Microsoft Visual Studio 2005 Standard Edition
 * Microsoft Visual Studio 2005 Professional Edition
 * Microsoft Visual Studio 2005 Express Edition

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SYMPTOMS
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.



CAUSE
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.



Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Visual Studio 2005 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Additionally, you can obtain this hotfix by visiting the following Microsoft Web site:

https://connect.microsoft.com/VisualStudio/Downloads/DownloadDetails.aspx?DownloadID=7249

Prerequisites
You must have Visual Studio 2005 Service Pack 1 (SP1) and Windows Workflow Foundation installed to apply this hotfix.

Restart requirement
You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
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 extensions for Windows Workflow Foundation, x86-based versions


STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
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

Keywords: kbexpertiseadvanced kbfix kbqfe kbpubtypekc KB936123

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