Thanks. That helps.
I'm wondering now why ui5 is trying to load Component-preload.js 404 (Not Found) in the project root. But it doesn't exist, so I am getting this error.
In the index.html I am defining the component like this:
<script>
sap.ui.localResources("project");
new sap.ui.core.ComponentContainer({
name : "project"
}).placeAt("content");
</script>
project stands for the root folder, maybe this is the problem?
I am also using sap.ui.localResources("project"); to set the right folder structure. Without it the app doesn't work at all. I am testing this right now locally with eclipse and the ui addon. The github is using sap.ui.demo... as structure.
For example when I'm declaring the component it looks like this:
jQuery.sap.declare("project.Component");