Now it works. Instead of using:
$image = array
(
'name' => 'Aara.jpg',
'type' => 'image/jpeg',
'bits' => new IXR_Base64 (dirname ( __FILE__).'/image.jpg')
);
I used:
$fs = filesize ($dirname ( __FILE__).'/image.jpg');
$file = fopen ($dirname ( __FILE__).'/image.jpg', 'rb');
$data = fread ($file, $fs);
fclose ($file);
$image = array
(
'name' => 'Aara.jpg',
'type' => 'image/jpeg',
'bits' => new IXR_Base64 ($data)
);
Thanks anyway!