getting ORA-19625 while creating standby database

Hi experts ,
Please shade light on it.  While creating standby database we observed following in log :

channel ORA_AUX_DISK_1: restoring control file
ORA-19625: error identifying file /rbackup/isddba_ems/contrlIMASTER.ctl
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
ORA-19600: input file is control file  (/rbackup/isddba_ems/contrlIMASTER.ctl)
ORA-19601: output file is control file  (/isdprod/ARUSBY/dbs/ctl/contrlARUSBY.ctl)
failover to previous backup

channel ORA_AUX_DISK_1: starting datafile backupset restore
channel ORA_AUX_DISK_1: restoring control file
channel ORA_AUX_DISK_1: reading from backup piece /arurac_fra/ARURAC/backupset/2011_10_02/o1_mf_ncnnf_ARURAC_INC0_111002_2_78l9ttwv_.bkp
ORA-19870: error reading backup piece /arurac_fra/ARURAC/backupset/2011_10_02/o1_mf_ncnnf_ARURAC_INC0_111002_2_78l9ttwv_.bkp
ORA-19505: failed to identify file "/arurac_fra/ARURAC/backupset/2011_10_02/o1_mf_ncnnf_ARURAC_INC0_111002_2_78l9ttwv_.bkp"
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
failover to copy on device type SBT_TAPE
channel ORA_AUX_SBT_TAPE_1: starting datafile backupset restore
channel ORA_AUX_SBT_TAPE_1: restoring control file
channel ORA_AUX_SBT_TAPE_1: reading from backup piece /rbackup/rmanbackups/ARURAC_RBKP_111002_225157/ARURAC_set146506_piece1
channel ORA_AUX_SBT_TAPE_1: restored backup piece 1
piece handle=/rbackup/rmanbackups/ARURAC_RBKP_111002_225157/ARURAC_set146506_piece1 tag=ARURAC_RBKP_111002_225157
channel ORA_AUX_SBT_TAPE_1: restore complete, elapsed time: 00:00:25
output filename=/isdprod/ARUSBY/dbs/ctl/contrlARUSBY.ctl
Finished restore at 11/10/03 07:06:42