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http://aticket2ride.org.uk/forum
When I have just installed and set up MyBB 1.4, but when I post or preview threads or messages I get the following warning message at the top. Can someone explain why and how I get rid of it please?

The following warnings occurred:
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Warning [2] preg_replace() [function.preg-replace]: Compilation failed: lookbehind assertion is not fixed length at offset 8 - Line: 406 - File: inc/class_parser.php PHP 5.2.6 (Linux)
File Line Function
[PHP] errorHandler->error
/inc/class_parser.php 406 preg_replace
/inc/class_parser.php 137 postParser->parse_smilies
/inc/functions_post.php 529 postParser->parse_message
/showthread.php 799 build_postbit
Reupload ./inc/class_parser.php

Also if an error is that long it's best to put it in [code] tags.
will I need to reinstall once reuploading the file?
No, not for something like that...
I have reloaded ./inc/class_parser.php onto the server and the message still occurs. What did you mean by in [code] tags? put what is [code] tags?
This:

[code*]Text here[/code*]

with no stars shows as:

Text here

And it won't take up much room as it creates a scroll bar.

But I'd just reinstall with fresh files as you haven't got any data to lose and would probably be quicker.
This is my third attempt, downloaded the files each time, and then cleared my sever each time.

And I get the same problem each time.
Might be a PMP misconfiguration then... what version of PHP does your host have??
they are just upgrading to PHP5
As in half way through the process??

That's probably why there's errors then...
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