Error: parsererror (200

this is my function.php script:

// Load any external files you have here
function ocdi_import_files() {
  return array(
    array(
      'import_file_name'             => 'Demo Import 1',
      'categories'                   => array( 'Category 1', 'Category 2' ),
      'local_import_file'            => trailingslashit( get_template_directory() ) . 'demo/sanayi-deniztasarm.WordPress.2019-07-16.xml',

      'import_preview_image_url'     => trailingslashit( get_template_directory() ) . 'demo/demo.jpg',
      'import_notice'                => __( 'After you import this demo, you will have to setup the slider separately.', 'your-textdomain' ),
      'preview_url'                  => 'http://www.your_domain.com/my-demo-1',
    ),

  );
}
add_filter( 'pt-ocdi/import_files', 'ocdi_import_files' );

and this is the error:

Error: parsererror (200)