rem: throw new Error("no URI!"); 
add: throw new Components.Exception("no URI!"); 
context:     getCommandUrl:    function( wcapCommand )    {        if (this.sessionUri == null)            throw new Error("no URI!");        // ensure established session, so userId is set;        // (calId defaults to userId) if not set:        this.getSessionId();        return (this.sessionUri.spec +                wcapCommand + ".wcap?appid=mozilla-calendar");    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/88a347723b7a4696ebc1ec2a320d6f1fe7ff1a0b/calWcapSession.js/buggy/calendar/providers/wcap/calWcapSession.js