HANA Cloud Platform - Productive - 404 when running index.html

Hello,

i created a simple app in HCP and everything worked fine but then i cut the index.html and copied it into the package main folder because i was trying to run the app from the HANA XS Applications tab in HCP.

Well since then i cant open the index.html - even if i copy it back. It always says 404 not found. Even the URL is right.

Also how can i manipulate the url of my application in the HANA XS applications window? I tried to edit the <"default_file": "index.html"> in the .xsaccess file but it didn´t work.