JavaScript - Internal Server Error

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ASP.NET

Javascript

This thread is similar to the one at Could not call a WebMthod with parameters[^]. The related codes are below:

var e = document.getElementById('DropDownRouteID');
var routeById = e.options[e.selectedIndex].text;
var mA = document.getElementById('MeasureA').value;
var mB = document.getElementById('MeasureB').value;
$.ajax( {
    type:'Get',
    url: 'SOEDefaultB2.aspx/GetData2',
    dataType: 'text',
    data: JSON.stringify({routeById: routeById, mA: mA, mB: mB}),
    contentType: 'application/json; charset=utf-8',
    crossDomain : true,
    success:function(results) {
        console.log('Success!');
        debugger;
        ajaxData = results;   },
    error: function(xhr, status, error) {
        debugger; console.log(error); }
});

 public static string[][] GetData2(string route, string mA, string mB) {
...  }

The error in the error:function shows 'Internal Server Error'. Please hint me where the error can be debugged. Thanks in adavnce.