Ajax call returns "An Error Was Encountered [ 500 ] Unable to load the requested file: default.html" error in pyrocms

Question

I have a Pyrocms view where I call a controller method using jQuery Ajax, like this

$('#search').click(function(){
var ionum =$('#ionum').val();
var csrf_hash_name = $('input[name=csrf_hash_name]').val();
$.ajax({
          type:"POST",
          url:"admin/ads/filter",
          data:"ionum="+ionum+"&csrf_hash_name="+csrf_hash_name,
          success:function(html){
              alert(html); 
          }
      })
  return false;
});

but is not working Every time it returns an error like this

An Error Was Encountered [ 500 ]  Unable to load the requested file: default.html

My controller method is just echoing a simple string i just want it work after that i will implement my logic controller method is as follows

 public function filter(){ 
    $ionum = $this->input->post('ionum');
    echo $ionum;
}

Answer 1

Actually i think its the csrf messing i have written it like that

data:"ionum="+ionum+"&csrf_hash_name="+csrf_hash_name,

by reordering it like this make it works

data:csrf_hash_name="+csrf_hash_name"+"&ionum="+ionum,

i wasted my four hours, i was wondering that there is something else that is making problem but its just the ordering issue.