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: 564
Code:
561. 
562.         
while(preg_match($pattern[0], $message) || preg_match($pattern[1], $message))
563.         {
564.             $message preg_replace($pattern$replace$message);
565.         }
566. 
567.         
if($text_only == false
Backtrace:
File Line Function
/inc/class_error.php 171 errorHandler->output_error
[PHP]   errorHandler->error
/inc/class_parser.php 564 preg_replace
/inc/class_parser.php 314 postParser->mycode_parse_quotes
/inc/class_parser.php 143 postParser->parse_mycode
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit