call_user_func_array error while using jQuery Vertical Accordion Menu

Site: http://www.almudarabah.com

Need a little help here. I am using WordPress 4.0.1 with Catch Everest Theme in English and custom CSS for RTL Arabic Text.

I am trying to use the Rich Text Editor but it’s giving me the following error line at the bottom of every page:

Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method dc_jqaccordion::footer() should not be called statically in C:\xampp\htdocs\almudarabah\wp-includes\plugin.php on line 505

I have checked other forums for the many solutions offered to resolve the Strict Standards error but am unable to fix the issue where dc_jqaccordion appears in Accordion Menu files.

The string for dc_jqaccordion can be found in the jQuery Vertical Accordion Menu and deactivating this plugin fixes the error.
But I want the Accordion Menu plugin also because I am using it for a secondary dropdown menu on the left of the pages.

The plugin.php has this code:

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

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);
}
`

this is line 505 from above code:

call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));

Please let me know what could be causing it and how to fix it.

Thanks

https://ww.wp.xz.cn/plugins/richtexteditor/