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I added the following code and got this error: I was trying to see what would appear if I tried the delicious feed for user id 4 on my site. Any help woukd be greatly appreciated

Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, ‘_bp_external_activity_refetch’ was given in /home/content/70/5722070/html/wp-includes/plugin.php on line 395

Code:

$external_activity_feeds = array(
array(
‘feed_url’ => ‘http://commons.gc.cuny.edu/wiki/index.php?title=Special:RecentChanges&feed=atom’,
‘feed_action’ => ‘%s edited the wiki page %s’,
‘component’ => ‘wiki’,
‘type’ => ‘wiki_edit’,
‘show_text’ => __( ‘Show Wiki Edits’, ‘bp-external-activity’ )
),
array(
‘feed_url’ => ‘http://feeds.delicious.com/v2/rss/boonebgorges?count=15’,
‘feed_action’ => ‘%s posted the link %s on Delicious’,
‘component’ => ‘delicious’,
‘type’ => ‘new_delicious_link’,
‘show_text’ => __( ‘Show Delicious Links’, ‘bp-external-activity’ ),
‘user_id’ => ‘4’,
),
);