Error message

• Notice: Trying to access array offset on value of type int in element_children() (line 6656 of /home/ptchemg/sekcje/cegss/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6656 of /home/ptchemg/sekcje/cegss/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6656 of /home/ptchemg/sekcje/cegss/includes/common.inc).
• Notice: Trying to access array offset on value of type null in calendar_plugin_row->render() (line 439 of /home/ptchemg/sekcje/cegss/sites/all/modules/calendar/includes/calendar_plugin_row.inc).
• Notice: Trying to access array offset on value of type null in calendar_plugin_row->render() (line 439 of /home/ptchemg/sekcje/cegss/sites/all/modules/calendar/includes/calendar_plugin_row.inc).
• Notice: Trying to access array offset on value of type null in calendar_plugin_row->render() (line 439 of /home/ptchemg/sekcje/cegss/sites/all/modules/calendar/includes/calendar_plugin_row.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6656 of /home/ptchemg/sekcje/cegss/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6656 of /home/ptchemg/sekcje/cegss/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6656 of /home/ptchemg/sekcje/cegss/includes/common.inc).
• Deprecated function: implode(): Passing glue string after array is deprecated. Swap the parameters in drupal_get_feeds() (line 394 of /home/ptchemg/sekcje/cegss/includes/common.inc).