postgres standby won't start

We have a standby set up between two sites in two different locations. The replication was going on well and suddenly it stopped due to error
2015-09-08 16:07:51 EDT LOG: streaming replication successfully connected to primary
2015-09-08 16:07:51 EDT FATAL: could not receive data from WAL stream: FATAL: requested WAL segment 0000000C0000035E000000F0 has already been removed

I am unable to start the DB as well.
Should I restore a fresh copy from production on to this standby to make things in order? If yes, how to go about it. I am quite new to Postgres. Any help/suggestions will be greatly appreciated.

Thanks
Kumar Ramalingam
Global Database Administration
Elavon, Atlanta , GA

678 731 5288

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