That error looks to be because the "verbose" option isn't specified correctly. You can use either "--verbose" or "-v", but I don't think the sencha command recognizes "-verbose". Try using this command instead:
sencha create jsb --verbose -a index.html -p app.jsb3
Although I must say, in any case, it would be nice to have a proper error message for an unrecognized flag instead of the unhelpful "TypeError: this.get is not a function".