php errors

Got a few php errors fpr ypou:

On frontend of the site:
Notice: Undefined offset: 0 in \wp-content\plugins\only-tweet-like-share-and-google-1\tweet-like-plusone.php on line 142

After attempting to save options:
Notice: options.php was called with an argument that is deprecated since version 2.7! The s4pabovepost setting is unregistered. Unregistered settings are deprecated. See http://codex.wordpress.org/Settings_API in \wp-includes\functions.php on line 2923

http://wordpress.org/extend/plugins/only-tweet-like-share-and-google-1/