why doesn't the following code work?

function RefreshActs()
{
        var req = opensocial.newDataRequest();
        req.add(req.newFetchActivitiesRequest("VIEWER"),
"viewer_activities");
        req.send(onLoadActivities);
}

function onLoadActivities(data)
{
        var activities = data.get('viewer_activities').getData()
['activities'];
        html = "<ul>";
        activities.each(ShowActs(activity));
        html += "<ul>";
        document.getElementById('Activities').innerHTML = "The activities:
<br>";
        document.getElementById('Activities').innerHTML += html;
}

function ShowActs(activity)
{
        html+="<li>"+
activity.getField(opensocial.Activity.Field.TITLE)+"</li><br>"
}

The Firefox Firbug says that "activities" is null. why?
By the way, I use Orkut Sandbox (open social 0.7).
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