MyBB Internal Error

MyBB has experienced an internal error and cannot continue.

Error Type:
(8192)
Error Message:
preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead
Location:
File: inc/class_parser.php
Line: 573
Code:
570. 
571.         
while(preg_match($pattern[0], $message) || preg_match($pattern[1], $message))
572.         {
573.             $message preg_replace($pattern$replace$message);
574.         }
575. 
576.         
if($text_only == false
Backtrace:
File Line Function
/inc/class_error.php 171 errorHandler->output_error
[PHP]   errorHandler->error
/inc/class_parser.php 573 preg_replace
/inc/class_parser.php 314 postParser->mycode_parse_quotes
/inc/class_parser.php 143 postParser->parse_mycode
/printthread.php 122 postParser->parse_message