lestercockerill on "[Plugin: Category Grid View Gallery] Error with pagelines theme"

Any ideas?... I'm not a coder but if anyone can point in the right direction that'd be great...

Line 403 in /homepages/36/d437724243/htdocs/wp-includes/plugin.php which the error refers to is 3rd from bottom in the function below;

function do_action($tag, $arg = '') {
global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter;

if ( ! isset($wp_actions) )
$wp_actions = array();

if ( ! isset($wp_actions[$tag]) )
$wp_actions[$tag] = 1;
else
++$wp_actions[$tag];

// Do 'all' actions first
if ( isset($wp_filter['all']) ) {
$wp_current_filter[] = $tag;
$all_args = func_get_args();
_wp_call_all_hook($all_args);
}

if ( !isset($wp_filter[$tag]) ) {
if ( isset($wp_filter['all']) )
array_pop($wp_current_filter);
return;
}

if ( !isset($wp_filter['all']) )
$wp_current_filter[] = $tag;

$args = array();
if ( is_array($arg) && 1 == count($arg) && isset($arg[0]) && is_object($arg[0]) ) // array(&$this)
$args[] =& $arg[0];
else
$args[] = $arg;
for ( $a = 2; $a < func_num_args(); $a++ )
$args[] = func_get_arg($a);

// Sort
if ( !isset( $merged_filters[ $tag ] ) ) {
ksort($wp_filter[$tag]);
$merged_filters[ $tag ] = true;
}

reset( $wp_filter[ $tag ] );

do {
foreach ( (array) current($wp_filter[$tag]) as $the_ )
if ( !is_null($the_['function']) )
call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));

} while ( next($wp_filter[$tag]) !== false );

array_pop($wp_current_filter);
}