"TNS-12542: TNS:address already in use" in LISTENER LOG FILE

Hi All,

I am getting following error in my listener log file. Will any explain why I am getting this error.

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error listening on: (ADDRESS=(PROTOCOL=TCP)(HOST=XXXXXXXXX)(PORT=XXXX))

30-NOV-2015 13:47:38 * service_register * XXXXX * 12542

TNS-12542: TNS:address already in use

TNS-12560: TNS:protocol adapter error

  TNS-00512: Address already in use

   Linux Error: 98: Address already in use

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Waiting for your kind and immediate response.

Thanks & Regards,

Qazi