phpbb and upgrade server

[mattai]

Hello.
I must make upgrade my server, change mysql from 4.2 to 5.1 - phpbb is not functioning.

Download phpbb3, during instalation firefox is display

[phpBB Debug] PHP Notice: in file /install/index.php on line 328: preg_match() [function.preg-match]: Internal pcre_fullinfo() error -3
[phpBB Debug] PHP Notice: in file /install/index.php on line 328: preg_match() [function.preg-match]: Internal pcre_fullinfo() error -3
[phpBB Debug] PHP Notice: in file /install/index.php on line 328: preg_match() [function.preg-match]: Internal pcre_fullinfo() error -3
.
.
Who causes such problems module php, maybe apache is not good seetings? Earlier in apache, all good works.