I just installed a Hotfix (Cumulative patch) on my windows 2003 server, running SP2007 sp2 as I was having trouble with Delay Activity and now get the following error in Visual Studio when entering debug mode with workflow. Any ideas how to cure this ?

Installed : http://support.microsoft.com/kb/2553022





8/30/2011 6:11:52 PM

Error in vs debug mode:

Error 1 Exception of type 'System.PlatformNotSupportedException' was thrown.

  • 2
    did you try running the configuration wizard after applying the patch? Please also accept answers for your questions so that you get good responses in the future.
    – Deepu Nair
    Commented Jan 15, 2012 at 17:52
  • Visual studio 2008?
    – Russell
    Commented Jan 16, 2012 at 8:33

2 Answers 2


Confirm your project is not pointing to .NET 4.0. It may have changed due to an update.

  • I ran configuration wizard, project uses .net3.5, re-installed VS2010, re-installed .net 3.5. But no luck, cannot remove patch either in add/remove programs. looks like a re-install of wss3sp2 :( Commented Jan 20, 2012 at 9:14

CHeck the Platform under your project's Build Tab, it should be set to AnyCPU, not x64 or or x86

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