Error message

• Warning: Undefined variable $navigation in include() (line 79 of sites/all/themes/aqua/templates/page.tpl.php).
• Warning: Cannot modify header information - headers already sent by (output started at /home/sunset/drupal7/includes/common.inc:2861) in drupal_send_headers() (line 1554 of includes/bootstrap.inc).
• TypeError: substr(): Argument #1 ($string) must be of type string, array given in substr() (line 242 of sites/all/modules/feeds/plugins/FeedsFetcher.inc).