PRB: "Unrecoverable build error" error message when you build Setup and Deployment projects (329214)

RESOLUTION

• Too many code and design windows open
  To resolve this problem, close any start, code, or design windows that are not being used from within the Visual Studio .NET interactive development environment (IDE). These windows are accessed by tabs or by MDI type in the work area of the IDE.
• Multiple folders have the same name
  To resolve this problem, assign a unique name to each folder in the Visual Studio .NET project.
• Missing registrations
  Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
  
  To resolve this problem, import or manually add the missing information to the registry. To do this, follow these steps:
  1. Click Start, and then click Run. In the Open text box, type regedit, and then click OK to start Registry Editor.
  2. Add the following registry keys:
     • HKEY_CLASSES_ROOT\Interface\{00020404-0000-0000-C000-000000000046}
       Set the Default value of this key to IEnumVARIANT
     • HKEY_CLASSES_ROOT\Interface\{00020404-0000-0000-C000-000000000046}\NumMethods
       Set the Default value of this key to 7
     • HKEY_CLASSES_ROOT\Interface\{00020404-0000-0000-C000-000000000046}\ProxyStubClsid
       Set the Default value of this key to {00020421-0000-0000-C000-000000000046}
     • HKEY_CLASSES_ROOT\Interface\{00020404-0000-0000-C000-000000000046}\ProxyStubClsid32
       Set the Default value of this key to {00020421-0000-0000-C000-000000000046}
• Mergemod.dll is not registered correctly
  To resolve this problem, register Mergemod.dll again. Typically, Mergemod.dll is located in the following folder:

  C:\Program Files\Common Files\Microsoft Shared\MSI Tools\Mergemod.dll

  To register the Mergemod.dll, type the following command at a command prompt, and then press ENTER:

  regsvr32 "C:\Program Files\Common Files\Microsoft Shared\MSI Tools\mergemod.dll"

• Upgrade from the Beta 2 version of Visual Studio .NET
  To resolve this problem, remove the Beta 2 version of Visual Studio .NET, and then reinstall the release version. For more information about how to remove the Visual Studio .NET Beta version, click the following article number to view the article in the Microsoft Knowledge Base:

  312383 How to remove Visual Studio .NET beta and release candidate versions