OpManager installing on Cent OS-64-bit

I have install the Cent OS 64-bit. Installing OpManager on that machine but it gives error such as

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Process : StartTelnetClientFE [ Started ]
Process : TopoFE [ Started ]

Verifying connection with web server ...

Failed to establish connection with web server. Gracefully shutting down OpManager.

Trying to Shutdown OpManager

Schedulers Stopped successfully

All Shut Down Observers Notified

Process : NmsSAServerFE [ Stopped ]
Process : StartTelnetClientFE [ Stopped ]
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I also copy the library file $HOME/OpManager/OpManager/lib/backup to $HOME/OpManager/OpManager/lib

Regards,
Qazafi