Update function in pset8 is raising an error

Question

I'm almost done with pset8 but the update function in scripts.js is not working.

This happens when I use the text box to search a place:

[24/Apr/2017 02:27:35] "GET /update?ne=NaN%2CNaN&q=&sw=NaN%2CNaN HTTP/1.1" 500 raise RuntimeError("invalid sw")

The maps neves loads.

When I simply drag to search other places It works perfectly.

function update() 
 {
// get map's bounds
var bounds = map.getBounds();
var ne = bounds.getNorthEast();
var sw = bounds.getSouthWest();
console.log(sw);

// get places within bounds (asynchronously)
var parameters = {
    ne: ne.lat() + "," + ne.lng(),
    q: $("#q").val(),
    sw: sw.lat() + "," + sw.lng()
};
$.getJSON(Flask.url_for("update"), parameters)
.done(function(data, textStatus, jqXHR) {

   // remove old markers from map
   removeMarkers();

   // add new markers to map
   for (var i = 0; i < data.length; i++)
   {
       addMarker(data[i]);
   }
})
.fail(function(jqXHR, textStatus, errorThrown) {

    // log error to browser's console
    console.log(errorThrown.toString());
});

}

Answer 1

A likely cause is the sql in the search function is not returning a column named latitude or longitude (or both). Spelling and case are critical.