Elfinder AJAX - Data is not JSON - php

Question

I am currently getting the folling error when trying to upload an image in Elfinder:
Invalid backend response. Data is not JSON.
I am 95% sure is is a ajax issue as when I take the code out of the switch it works just fine. Even in the switch I am able to view all files and directories but uploads are still an issue
Here is my PHP:
if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && ($_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest'))
{
$admin = new systemAdmin;
$response = array('ok' => 0);
$type = (isset($_GET['type'])) ? $_GET['type'] : '';
switch ($type)
{
case 'connector':
if(in_array('filemanager',$admin->user_auth['authority']))
{
include_once($admin->get_setting(5) . '/classes/core/class.elFinderConnector.php');
include_once($admin->get_setting(5) . '/classes/core/class.elFinder.php');
include_once($admin->get_setting(5) . '/classes/core/class.elFinderVolumeDriver.php');
include_once($admin->get_setting(5) . '/classes/core/class.elFinderVolumeLocalFileSystem.php');
$opts = array(
'locale' => 'en_US.UTF-8',
'roots' => array(
array(
'driver' => 'LocalFileSystem',
'path' => $admin->get_setting(5) . '/media/',
'startPath' => $admin->get_setting(5) . '/media/',
'URL' => $admin->get_setting(2) . '/media/',
'treeDeep' => 3,
'alias' => 'Filemanager',
'mimeDetect' => 'internal',
'tmbPath' => '_thumbs',
'utf8fix' => true,
'tmbCrop' => true,
'tmbBgColor' => 'transparent',
'accessControl' => 'access',
'acceptedName' => '/^[^\.].*$/',
'attributes' => array(
array(
'pattern' => '/\.js$/',
'read' => false, 'write' => false, 'hidden' => true, 'locked' => true
),
array(
'pattern' => '/\.htaccess$/',
'read' => false, 'write' => false, 'hidden' => true, 'locked' => true
),
array(
'pattern' => '/_thumbs/',
'read' => false, 'write' => false, 'hidden' => true, 'locked' => true
),
array(
'pattern' => '/featured/',
'read' => false, 'write' => false, 'hidden' => true, 'locked' => true
)
)
),
)
);
header('Access-Control-Allow-Origin: *');
$connector = new elFinderConnector(new elFinder($opts), true);
$connector->run();
}
break;
}
ob_clean();
header('Cache-Control: no-cache, must-revalidate');
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
header('Content-type: application/json');
echo json_encode($response);
}
And here is my JS:
var funcNum = getUrlParam('CKEditorFuncNum');
var elf = $('#fileManager').elfinder({
commandsOptions : {
getfile : {
onlyURL : true,
multiple : false,
folders : false,
oncomplete : ''
}
},
height: '488',
url : '/ajax.html?type=connector',
getFileCallback : function(getfile) {
window.opener.CKEDITOR.tools.callFunction(funcNum, getfile);
window.close();
},
resizable: false
}).elfinder('instance');