When i use the commands from the 'Getting started with Ext JS 4" guide, to create a production build from the designer 2.0 generated files:

sencha create jsb -a designer.html -p app.jsb3
sencha build -p app.jsb3 -d .

I end up with empty files, the jsb3 file doesn´t list any files in the files array.

What am i doing wrong ? Do i have to add the files manually to the jsb3 file ?

Best regards
Andreas