The application Error
The conection to the server was unsuccessful (file://android_asset/www/index.html)
Was caused by a script being inaccessible during the page load..
For me changing:
<script src="http://oldplace:8080/target/target-script-min.js"></script>
To
<script src="http://newplace:8080/target/target-script-min.js"></script>
Fixed it