GWT HTML5 NOT RUN

Hi at all,
I'm migrating my platform from gears to html5 tecnology.
I try to get offline my app and i find this video:

http://www.youtube.com/watch?v=omBURP0MxcI

that say me how to create dynamically an manifest file.
It works, but the app doesn't goes offline.
I think that the problem is in the "text/cache-manifest manifest".
Can anyone help me?

Thx, markus

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