Error message

• Notice: Trying to access array offset on value of type int in element_children() (line 6542 of /home1/ceilaoc1/public_html/seelanrangerssportsclub/includes/common.inc).
• Deprecated function: implode(): Passing glue string after array is deprecated. Swap the parameters in drupal_get_feeds() (line 394 of /home1/ceilaoc1/public_html/seelanrangerssportsclub/includes/common.inc).
• Deprecated function: The each() function is deprecated. This message will be suppressed on further calls in menu_set_active_trail() (line 2404 of /home1/ceilaoc1/public_html/seelanrangerssportsclub/includes/menu.inc).