Just some Notices with debug true

I changed/added following in external-media-without-import.php because of the nasty notices.
Removed the code between namespace emwi; and the first add_action lines
and added following code to get rid of those nasty notices:

function loading_scripts($hook)
{
    $js_ver  = date("ymd-Gis", filemtime( plugin_dir_path( __FILE__ ) . '/external-media-without-import.js' ));
    $css_ver = date("ymd-Gis", filemtime( plugin_dir_path( __FILE__ ) . '/external-media-without-import.css' ));

    wp_enqueue_script( 'emwi-js', plugins_url( '/external-media-without-import.js', __FILE__ ), array(), $js_ver );
    wp_register_style( 'emwi-css', plugins_url( '/external-media-without-import.css', __FILE__ ), false, $css_ver );
    wp_enqueue_style( 'emwi-css' ); 
}
add_action('wp_enqueue_scripts', 'loading_scripts');

Hope it helps somebody.