How do I fix Visual studio 2010 error message "CCHandler uninitialized" when running WP7 XNA projects?

When I try and run a Windows Phone 7 project it fails and displays a message box:

"CCHandler uninitialized"

In the errors 开发者_JAVA技巧window is a single error:

"No target is available for deploying."

And it won't run. I've tried a full uninstall+reinstall of both visual studio and all the WP7 tools and the problem remains.

It's the same for totally new projects and for several existing projects I have that run fine on my other PC.

Also, the options for where to deploy (Emulator/Device) seem to be missing from the project properties and toolbar.

WP7 silverlight projects also fail, but with a different popup (and no message in the errors window):

"Exception from HRESULT: 0x89721800"

I've tried just running the WP7 emulator from the start menu and nothing happens (no error, nothing)

Does anyone have any ideas?

_{Visual Studio 2010 pro. (I've tried with and without SP1)}

Windows 7 pro x64.

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After some digging this appears to be caused by installation order of SP1.

If you install VS2010 SP1 before the phone 7 tools, it does not appear to correctly install, and even an uninstall and reinstall of VS does not appear to fix the problem. (although perhaps I wasn't finding everything that needed to be uninstalled)

I would recommend that you follow this install sequence:

1. Visual Studio 2010
2. Phone tools (all of them, from the app hub site, in the order they recommend)
3. VS2010 SP1

[This applies to the initial releases of the phone 7 tools, I don't know what the situation is with the mango beta tools]