Server Plugins (Bukkit 1.7.2)

I have a problem with my server.I install muck of plugins but i have just one working on server.Why i have this problem and how can i fix that
(every time then i reset the server the plugin changed)

Thanks.

Quote from Goldzora

Make sure your plugins are compatible with your current CraftBukkit-Installation and you configured them correctly. Check your log for additional information.

Not working

Quote from Goldzora

What exactly is not working? What happens if you do

Code

/pl

as command?

I reinstall the server and it's working