All of sudden started getting this error message for builds. Application is UWP VS 2017.

AppxManifest.xml : error APPX0501: Validation error. error C00CE012: App manifest validation error: The app manifest must be valid as per schema: Line 64, Column 8, Reason: Content for element ‘{http://schemas.microsoft.com/appx/manifest/foundation/windows10}InProcessServer’ is incomplete according to the DTD/Schema. Expecting: {http://schemas.microsoft.com/appx/manifest/foundation/windows10}ActivatableClass.