Fatal Error in PHP.ErrorHandler();

syntax error, unexpected '!' in Unknown on line 1

The error occurred on or near: /home/instalbz/public_html/community/library/core/class.handshakeauthenticator.php

149:             $Result = json_decode($Response, TRUE);
150:             break;
151:          case 'ini':
152:          default:
153:             $Result = parse_ini_string($Response);
154:             break;
155:       }
156:       $this->_HandshakeData = $Result;
157:       return $Result;


[/home/instalbz/public_html/community/library/core/functions.error.php:132] PHP::include();
[/home/instalbz/public_html/community/library/core/functions.error.php:132] PHP::ErrorHandler();
[/home/instalbz/public_html/community/library/core/class.handshakeauthenticator.php:153] PHP::parse_ini_string();
[/home/instalbz/public_html/community/library/core/class.handshakeauthenticator.php:172] Gdn_HandshakeAuthenticator->GetHandshakeData();
[/home/instalbz/public_html/community/library/core/class.session.php:225] Gdn_HandshakeAuthenticator->GetIdentity();
[/home/instalbz/public_html/community/index.php:33] Gdn_Session->Start();

Variables in local scope:

[UrlParts] array (
  'scheme' => 'http',
  'host' => 'www.instalbiz.com',
  'path' => '/testss.php',
[Host] 'www.instalbiz.com'
[Port] '80'
[Path] '/testss.php'
[Referer] 'http://www.instalbiz.com/community'
[Query] ''
[ErrorNumber] 0
[Error] ''
[Pointer] NULL
[Cookie] ''
[Header] 'GET /testss.php? HTTP/1.1
Host: www.instalbiz.com
User-Agent: Vanilla/2.0
Accept: */*
Accept-Charset: utf-8;
Referer: http://www.instalbiz.com/community
Connection: close

[Response] '<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<title>404 Not Found</title>
<h1>Not Found</h1>
<p>The requested URL /testss.php was not found on this server.</p>
<p>Additionally, a 404 Not Found
error was encountered while trying to use an ErrorDocument to handle the request.</p>
[InBody] false
[Line] ''

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