If you get error code 0x89721800 when attempting to deploy to your phone device, this typically indicates that the Visual Studio datastore is corrupt. Here are a couple of workarounds:
Workaround #1
1. Close all Visual Studio instances that may be currently running.
2. Delete the folder “%LOCALAPPDATA%\Microsoft\Phone Tools\CoreCon\10.0”
3. Launch a new instance of Visual Studio
Workaround #2
The above error code has also been reported when Windows Mobile 5x or 6x emulators are installed in the system. Try uninstalling them both.
Hope this helps,
Mark
