What does this error mean? Please help me

I have a linux server and licanced vbulletin. I have php5.0 and i installed ioncube and got this error
Site error: the file /var/www/vhosts/knightonline.gen.tr/httpdocs/includes/functions_vbseo.php requires the ionCube PHP Loader ioncube_loader_lin_5.0.so to be installed by the site administrator
what does it mean? how can is solve this problem?

PHP Encoder, protection, installer and performance tools from ionCube: Loader Download

You can download the latest ionCube loaders for your operating system there, and extract to the "ioncube" directory under your forums directory.

Yes but on my server i use "php safe mod = on" because of video share script. But ioncube says
Run-Time Loading Installation Instructions
"and ask them to disable safe mode for your account."

You may have to ask your host to install ionCube via PHP.INI in that case.

You can remove all vBSEO files and the .htaccess file to recover your site until they can get it installed for you.

I have my own dedicated server i can enter server but i dont know how to install it via php.ini and which version i need to download from ioncube :(

According to the error message you posted, you need the linux version. They include installation instructions. It's pretty easy to do; just a matter of putting the files on your server and adding a line to PHP.INI.

Hello so so thanks for these informations. My problem is solved. Just i have another problem. My website started to work so so slowly nearly %50 more slowly. What i need to make?

What were your server load levels before installing vBSEO? What are the levels now?

Thanks

How will i look it? I didint change anything. Just dedicated server installed it and i asked them . They say they didint change anything

[root@web ~]# w
15:26:22 up 17 days, 20 min, 1 user, load average: 23.97, 23.51, 20.94
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts 85.99.115.186 15:25 3.00s 0.02s 0.00s w
[root@web ~]#
These are informations which i took? Do you ask them?

15:29:08 up 17 days, 23 min, 1 user, load average: 18.13, 21.31, 20.52

Those load levels are EXTREMELY high. Please disable vBSEO (the first option in your vbseocp.php control panel). Leave it disabled for a bit and then check your load levels again.

Thanks

15:49:31 up 17 days, 43 min, 1 user, load average: 5.81, 5.16, 10.72

Hello i disabled vbseo and got these stats and my forum is working well now but when i active vbseo it's so so slow

16:00:33 up 17 days, 54 min, 1 user, load average: 6.09, 4.94, 7.58

How many CPUs are in your server? If it's a single-CPU server, those loads are already quite high.