Hi,

I am using Visual Studio 2008 Pro on Windows 7 64-bit, fully patched up. I get this error when I'm developing my WPF app. It only happens in debug mode when a button click event fires. It doesn't happen when I launch the application with 'Start without Debugging' or when I start it from Windows Explorer.

An event was unable to invoke any of the subscribers (Exception from HRESULT: 0x80040201)
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
at MS.Internal.Automation.UiaCoreProviderApi.CheckError(Int32 hr)

Regards,
Pieter Breed

Hi Peter,

I was having exactly the same problem on the 32 bit version of Win 7. I tried running VS2008 in safe mode and the error disappeared. Turns out it was devexpress coderush plugin causing the problem.

Hope this helps.

JK

Hi Pieter,

Would you please describe how did the issue occur? Or, could we generate a code snippet to reproduce the issue?

Thanks a lot!

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Hi Peter,

I was having exactly the same problem on the 32 bit version of Win 7. I tried running VS2008 in safe mode and the error disappeared. Turns out it was devexpress coderush plugin causing the problem.

Hope this helps.

JK

The weird thing is that I have absolutely no idea how to replicate it. For about a week, my app was structured a specific way and this problem happened every time that I clicked on a specific button. Then when the feature matured, I moved it to a different project and now I'm not getting the error anymore. I do have the devexpress plugin installed (the free one) and will look at uninstalling that if the problem comes back.

Thanks!

My app worked fine for a while, then I made a small code change and now it has its knickers up in a twist again and I don't know why. If I undo the changes I made it doesn't start working either. I'm flumoxed. How do you disable the DXCore? I tried running the app in safemode, but then the WPF projects won't load.

P

Hi Pieter,

You can go to the DevExpress tab on VS abd click on the unload command.

JK