ModX site is down. Getting error message...

/**
 * RC Link Redirector
 * 
 * Plugin that replaces external links to encrypted internal links
 *
 * @category 	plugin
 * @version 	0.8.2+
 * @license 	http://www.gnu.org/copyleft/gpl.html GNU Public License (GPL)
 * @author      Roland Chanishvili, additions by Temus
 * @internal	@properties &rcr_comment_text=Convert link text;list;true,false;true;&rcr_comment_text_val=Link text;text;[link];&rcr_blank=Add target;list;true,false;true;&rcr_nofollow=Add nofollow;list;true,false;true;&rcr_relink_val=Base link;text;ext;&rcr_noindex=Add noindex;list;true,false;false;&rcr_rel_stop=Use stop rel;list;true,false;false;&rcr_rel_val=Rel;text;&rcr_class_stop=Use stop class;list;true,false;false;&rcr_class_val=Class;text;&rcr_stop=Use stop list;list;true,false;true;&rcr_stop_list=Stop list;textarea;yandex.ru,google.com;
 * @internal	@events OnWebPagePrerender 
 * @internal	@modx_category SEO
 */

/*
Plugin: RC Link Redirector 0.8.2+
Created By: Roland Chanishvili (http://chanishvili.org/)
Adaptation for MODx: Temus ([email protected])
Events: OnWebPagePrerender
Configuration:
&rcr_comment_text=Convert link text;list;true,false;true;
&rcr_comment_text_val=Link text;text;[link];
&rcr_blank=Add target;list;true,false;true;
&rcr_nofollow=Add nofollow;list;true,false;true;
&rcr_relink_val=Base link;text;ext;
&rcr_noindex=Add noindex;list;true,false;false;
&rcr_rel_stop=Use stop rel;list;true,false;false;
&rcr_rel_val=Rel;text;
&rcr_class_stop=Use stop class;list;true,false;false;
&rcr_class_val=Class;text;
&rcr_stop=Use stop list;list;true,false;true;
&rcr_stop_list=Stop list;textarea;yandex.ru,google.com;
*/

global $rcr_opt;
$rcr_opt = array(
	'rcr_comment_text' => isset($rcr_comment_text)&&($rcr_comment_text=='false') ? 0 : 1, //change link text to comment text
	'rcr_comment_text_val' => isset($rcr_comment_text_val) ? $rcr_comment_text_val : "[link]", 
	'rcr_blank' => isset($rcr_blank)&&($rcr_blank=='false') ? 0 : 1, //add target=_blank (except files)
	'rcr_nofollow' => isset($rcr_nofollow)&&($rcr_nofollow=='false') ? 0 : 1, //add rel=nofollow
	'rcr_relink_val' => isset($rcr_relink_val) ? $rcr_relink_val : "ext", //base link for redirect
	'rcr_noindex' => isset($rcr_noindex)&&($rcr_noindex=='true') ? 1 : 0, //add noindex
	'rcr_rel_stop' => isset($rcr_rel_stop)&&($rcr_rel_stop=='true') ? 1 : 0, //use stop rel value
	'rcr_rel_val' => isset($rcr_rel_val) ? $rcr_rel_val : "", 
	'rcr_class_stop' => isset($rcr_class_stop)&&($rcr_class_stop=='true') ? 1 : 0, //use stop CSS class
	'rcr_class_val' => isset($rcr_class_val) ? $rcr_class_val : "",
	'rcr_stop' => isset($rcr_stop)&&($rcr_stop=='false') ? 0 : 1, //use stop list
	'rcr_stop_list' => isset($rcr_stop_list) ? $rcr_stop_list : "yandex.ru,google.com" // stop list
);

############### PHP4 compatibility ###############
if (!function_exists("stripos")) {
	function stripos($str,$needle,$offset=0)
	{
		return strpos(strtolower($str),strtolower($needle),$offset);
	}
}

#################### FUNCTIONS ###################
function rcr_redirect()
{
	global $rcr_opt,$modx;
	$url=$_SERVER['REQUEST_URI'];
	if(($url[0]!='/') and ($url[strlen($url)]!='/'))return;
	$uarr=explode("/",$url);
	if(!isset($rcr_opt['rcr_relink_val'])) return;
	$incr = 0;
	foreach ($uarr as $chpu) {
		if ($chpu == $rcr_opt['rcr_relink_val']) {
			$todo = '/^.*' . $chpu . '\//';
			$link = preg_replace($todo,'',$url);
			$link = str_replace("==/",'==',$link);
			$rederectlink = html_entity_decode(rcr_crypt(base64_decode($link)));
			if (preg_match('/^(https:|http:|ftp:)/i', $rederectlink)) $modx->sendRedirect($rederectlink,0,'REDIRECT_HEADER','HTTP/1.1 302 Found');
			else $modx->sendRedirect($modx->config['site_url'].md5($rederectlink),0,'REDIRECT_HEADER','HTTP/1.0 404 Not Found');
			exit;
		}
	$incr++;
	}
}

function rcr_crypt($str)
{
	global $rcr_opt;
	if(empty($rcr_opt['secreet'])) return $str;
	$key=str_pad('', strlen($str), $rcr_opt['secreet'], STR_PAD_RIGHT);
	for($i=0;$i<strlen($str);$i++){
		$str[$i] = chr(ord($str[$i]) ^ ord($key[$i]));
	}
	return $str;
}

function rcr_isstopwords($data)
{
	global  $rcr_opt;
	if($rcr_opt['rcr_stop']){
	$list = explode(",",$rcr_opt['rcr_stop_list']);
	foreach($list as $sw)
		if(stripos($data, trim($sw))!==false) return true;
	}
	return false;
}

function rcr_isstoprel($data)
{
	global $rcr_opt;
	if($rcr_opt['rcr_rel_stop']){
		$needle = "rel=\"".$rcr_opt['rcr_rel_val']."\"";
		if(stripos($data, $needle)!==false) return true;
		$needle = "rel='".$rcr_opt['rcr_rel_val']."'";
		if(stripos($data, $needle)!==false) return true;
	}
	if($rcr_opt['rcr_class_stop']){
		$needle = "class=\"".$rcr_opt['rcr_class_val']."\"";
		if(stripos($data, $needle)!==false) return true;
		$needle = "class='".$rcr_opt['rcr_class_val']."'";
		if(stripos($data, $needle)!==false) return true;
	}
	return false;
}

function rcr_iscanblank($data)
{
	global $rcr_opt;
	if (!$rcr_opt['rcr_blank']) return false;
	if ((stripos($data, '.exe')!==false) or (stripos($data, '.zip')!==false) or
		(stripos($data, '.rar')!==false) or (stripos($data, '.msi')!==false)) return false;
	return true;

}

function rcr_encode($data)
{
	global $rcr_opt, $modx;
	$home = $modx->config['site_url'];
	preg_match_all('#<a(?:.*?)href(?:\s*)=(?:\s*)[\"\']((https?|ftp):\/\/\S*?)[\"\']([^>]*)>(.*?)<\/a>#im',$data,$arr);
	for ($i=0; $i<count($arr[0]); $i++) {
		if(stripos($arr[1][$i],$home)!==0){
			if(rcr_isstoprel($arr[0][$i])==false){
				if(rcr_isstopwords($arr[1][$i])==false){
					if (!stristr($arr[0][$i], 'javascript:')) {
						$tmp = $arr[0][$i];
						if($rcr_opt['rcr_comment_text']==true){
							if(strpos($arr[4][$i],'<img')===false){
								if (preg_match('/\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|]/im', $arr[4][$i])) $tmp = str_replace('>'.$arr[4][$i].'<','>'.$rcr_opt['rcr_comment_text_val'].'<',$tmp);
							}
						}
						//$tmp = str_replace($arr[1][$i],$home.$rcr_opt['rcr_relink_val'].'/'.base64_encode(rcr_crypt($arr[1][$i])).'/',$tmp);
						//Temus: broken external images
						$tmp = substr_replace($tmp, $home.$rcr_opt['rcr_relink_val'].'/'.base64_encode(rcr_crypt($arr[1][$i])).'/', strpos($tmp, $arr[1][$i]), strlen($arr[1][$i]));
						if(rcr_iscanblank($arr[0][$i])) {
							$tmp = preg_replace('/target=["\'][^\'".]+["\']/', '', $tmp);
							$tmp = str_replace('<a','<a target="_blank"',$tmp);
						}
						if($rcr_opt['rcr_nofollow']){
							$tmp = preg_replace('/rel=["\'][^\'".]+["\']/', '', $tmp);
							$tmp = str_replace('<a','<a rel="nofollow"',$tmp);
						}
						if($rcr_opt['rcr_noindex']){
							$tmp = str_replace('</a>','</a></noindex>',$tmp);
							$tmp = str_replace('<a','<noindex><a',$tmp);
						}
						$data = str_replace($arr[0][$i],$tmp,$data);
					}
				}
			}else {
				$tmp = preg_replace('/rel=["\'][^\'".]+["\']/', '', $arr[0][$i]);
				$data = str_replace($arr[0][$i],$tmp,$data);
			}
		}
	}
return $data;
}

################################################

switch($modx->Event->name) {
	case 'OnWebPagePrerender' :
		rcr_redirect();
		$modx->documentOutput = rcr_encode(&$modx->documentOutput);
	break;
}

<li[+wf.id+][+wf.classes+]>
  <a href="[+wf.link+]" title="[+wf.title+]" [+wf.attributes+]>[+wf.linktext+]</a>
  [+wf.wrapper+]
</li>