Oracle backup fails assigning device SBT_TAPE with error 7111 (4037505)

NetVault 10.01

NetVault Plug-in for Oracle  Version: 7.1.1

Oracle backup fails assigning device sbt_tape with error 7111 as seen in binary extract below:

Information        2015/02/02 16:50:55       352        Data Plugin         BDULMA              RMAN-03009: failure allocate command in the channel c1 02/02/2015 17:50:55

Information        2015/02/02 16:50:55       352        Data Plugin         BDULMA              ORA-19554:  error in assigning the device, device type: sbt_tape, device name:

Information        2015/02/02 16:50:55       352        Data Plugin         BDULMA              ORA-27000:  skgfqsbi: failed to initialize storage subsystem level (SBT)

Information        2015/02/02 16:50:55       352        Data Plugin         BDULMA              ORA-19511:  I received error level media manager f musicians, error text?:

Information        2015/02/02 16:50:55       352        Data Plugin         BDULMA                 SBT error = 7111, errno = 0, sbtinit: system error