I am trying to run a CAML query to sort through some data. Once the page finishes loading i do not get the results i want. I checked the functions and it turns out that for some reason, my CAML query returns undefined. It only does this after it is passed in the set_viewXml() function. Code provided below:

var runQuery = function (dateObj, query, success, failure, context) {

   var camlQuery = new SP.CamlQuery();

   alert(query); // shows the CAML query
   alert(camlQuery.set_viewXml(query(dateObj))); // shows me undefined

   camlQuery.set_viewXml(query(dateObj));
   
   items = list.getItems(camlQuery);

   context.load(items);

   context.executeQueryAsync(success, failure);
};

Here is the CAML:

"<View>" + 
   "<Query>" +
      "<Where>" + 
         "<And>" +
            "<Eq>" +
               "<FieldRef Name='EventStartDate' />" +
               "<Value Type='DateTime' IncludeTimeValue='FALSE'>" +
                  dateObj.toISOString() +
               "</Value>" +
            "</Eq>" +
            "<Eq><FieldRef Name=\"QueryID\" /><Value Type=\"Text\">2216</Value></Eq>" +
         "</And>" +
      "</Where>" +
      "<GroupBy><FieldRef Name='EventName'></FieldRef></GroupBy>"+
      "<OrderBy><FieldRef Name='EventStartDate' /><FieldRef Name='EventEndDate' /><FieldRef Name='EventName' /></OrderBy>" +
   "</Query>" +
"</View>";

I am pretty sure there is something wrong with the CAML query because i do not work with it on a day to day basis.