UWP: Deployment error: Cannot register the xxxxx package because the extension is missing an EntryPoint or StartPage attribute. (0x80073cf6)

I try to create an JS UWP App with a win32 fullTrustProcess AppService extension. I followed the example here: https://github.com/Microsoft/DesktopBridgeToUWP-Samples/tree/master/Samples/AppServiceBridgeSample but when I try to deploy to local machine (Windows 10 with anniversary update) then I get a deployment error:

DEP0700 : Registration of the app failed. AppxManifest.xml(49,10): error 0x80080204: Cannot register the xxxxx package because the extension is missing an EntryPoint or StartPage attribute. (0x80073cf6)
Deployment of the application to the target device failed.

The extension part of the manifest:

<Extensions>
    <uap:Extension Category="windows.appService"> <!-- line 49 from error -->
        <uap:AppService Name="CommunicationService" />
    </uap:Extension>
    <desktop:Extension Category="windows.fullTrustProcess" Executable="bin\mywin32.exe" />
</Extensions>

To make this work in WINJS UWP app, please follow these steps:

1. Add EntryPoint attribute for the fullTrustProcess extension:

<desktop:Extension Category="windows.fullTrustProcess" Executable="BackgroundProcess.exe" EntryPoint="Windows.FullTrustApplication" />

2. Set StartPage attribute for appService extension:

<uap:Extension Category="windows.appService" StartPage="index.html"> <uap:AppService Name="CommunicationService" /> </uap:Extension>

3. Change the TargetDeviceFamily to Desktop and ensure MinVersion above 14257:

<TargetDeviceFamily Name="Windows.Desktop" MinVersion="10.0.14393.0" MaxVersionTested="10.0.14393.0" />

Check my demo here: https://github.com/Myfreedom614/UWP-Samples/tree/master/AppServiceBridgeSample