Apache Version Number Error

[TitanKing]

Hello

I have just installed PHPDevShell V 2.8.1 Everythimg looks to be working fine; Logged as admin i went to menu:
System Managment->System Status->System Info

and received this error:

Fatal error: Call to undefined function apache_get_version() in /home/ivanrv/public_html/ivanrv/plugins/PHPDevShell/scripts/system-admin/admin.php on line 33

line 33 is:

$apache_get_version = apache_get_version();

but problem may be some where else because line is apparently ok i guess.
Would like to know the cause of this error.

running on:
Apache version 2.2.13 (Unix)
PHP version 5.2.9
MySQL version 5.0.81-community-log
Architecture x86_64
Operating system Linux

Thanks