Try replacing this
System.config({
packages: {
format: 'register',
defaultExtension: 'js'
}
});
with this
System.config({
packages: {
app: { // must match your folder name
format: 'register',
defaultExtension: 'js'
}
}
});
I was trying to apply a slightly different folder structure to their quickstart and ran into the same issue. I found that the name of the property on the “packages” object had to match the parent folder.