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GAE/J Channel API exception even though messages go through?
getToken = function () {
    xhr = new XMLHttpRequest();
    xhr.open("GET", "/game?action=getChannelToken", true);
    xhr.send(null);
    xhr.onreadystatechange = function() {
        if (this.readyState == 4 && this.status==200) {
            connect(xhr.responseText);
        }
    };
};

ChannelService channelService = ChannelServiceFactory.getChannelService();
channelToken = channelService.createChannel(uid);

connect = function (token) {
//  alert ("connect");
    var channel = new goog.appengine.Channel(token);
    var socket = channel.open();
    socket.onopen = onOpened;
    socket.onmessage = onMessage;
    socket.onerror = onError;
    socket.onclose = onClose;
};