New Post: "_spUserId is undefined" error when including the ALPHA

    function SPServicesContext() {
    
        // SharePoint 2010 gives us a context variable
        if(typeof _spPageContextInfo !== "undefined") {
            this.thisSite = _spPageContextInfo.webServerRelativeUrl;
            this.thisList = _spPageContextInfo.pageListId;
            this.thisUserId = _spPageContextInfo.userId;
        // In SharePoint 2007, we know the UserID only
        } else {
            this.thisSite = "";
            this.thisList = "";
            this.thisUserId = (typeof _spUserId !== "undefined") ? _spUserId : undefined;
        }