Forum PHP.pl

Przepraszam, odcień mojej zieloności w php jest tym najbardziej rażącym po oczach.
W wordpressie (4.2.2) wyskakują mi takie błędy:
Warning: Missing argument 1 for register_activation_hook(), called in /home/virtualki/130388/wp-content/plugins/simple-picture-menu/index.php on line 29 and defined in /home/virtualki/130388/wp-includes/plugin.php on line 739
Warning: Missing argument 2 for register_activation_hook(), called in /home/virtualki/130388/wp-content/plugins/simple-picture-menu/index.php on line 29 and defined in /home/virtualki/130388/wp-includes/plugin.php on line 739
Warning: Missing argument 1 for register_deactivation_hook(), called in /home/virtualki/130388/wp-content/plugins/simple-picture-menu/index.php on line 30 and defined in /home/virtualki/130388/wp-includes/plugin.php on line 762
Warning: Missing argument 2 for register_deactivation_hook(), called in /home/virtualki/130388/wp-content/plugins/simple-picture-menu/index.php on line 30 and defined in /home/virtualki/130388/wp-includes/plugin.php on line 762
Warning: Missing argument 1 for register_uninstall_hook(), called in /home/virtualki/130388/wp-content/plugins/simple-picture-menu/index.php on line 31 and defined in /home/virtualki/130388/wp-includes/plugin.php on line 793
Warning: Missing argument 2 for register_uninstall_hook(), called in /home/virtualki/130388/wp-content/plugins/simple-picture-menu/index.php on line 31 and defined in /home/virtualki/130388/wp-includes/plugin.php on line 793

Bardzo proszę o pomoc, znalazłem na serwerze te dwa pliki, w wymienionych wyżej linijkach następuje:
- w pliku index.php:
register_activation_hook();
register_deactivation_hook();
register_uninstall_hook();

- w pliku plugin.php:
linijka 739 (i trzy następne):
function register_activation_hook($file, $function) {
$file = plugin_basename($file);
add_action('activate_' . $file, $function);
}
linijka 762:
function register_deactivation_hook($file, $function) {
$file = plugin_basename($file);
add_action('deactivate_' . $file, $function);
}
linijka 793:
function register_uninstall_hook( $file, $callback ) {
if ( is_array( $callback ) && is_object( $callback[0] ) ) {
_doing_it_wrong( __FUNCTION__, __( 'Only a static class method or function can be used in an uninstall hook.' ), '3.1' );
return;
}

Z góry dziękuję za wszelką pomoc i przepraszam, za laicki język.
Pozdrawiam