The error message indicates that the feed specified in FeedUrl (the "blank" for it appears in one of the channel creation dialogs) could not be retrieved. Please ensure that you entered the right URL. (I typically cut and paste to help avoid typing mistakes.)
While you may have typed all the right characters, depending on the version of Awasu you are using, after entering the URL in the dialog box you must do something for the value to actually be accepted -- click somewhere outside the FeedUrl box (though still in the containing dialog box), or whatever. If this doesn't make sense, let me know and I'll try to explain better.
Please keep me advised until you get it working.
(And congratulations on installing all the stuff -- not a minor task...