how to config raw backup in networker 7.4 on centos6.3

my config:

save:

<< /dev/mapper >>

rawasm: VolGroup00-oralv

[root@oracle /dev/VolGroup00]#lvs

  /dev/hdc: open failed: No medium found

  LV       VG         Attr   LSize  Origin Snap%  Move Log Copy%  Convert

  LogVol00 VolGroup00 -wi-ao 19.84G                                     

  LogVol01 VolGroup00 -wi-ao  5.81G                                     

  oraclelv VolGroup00 -wi-ao 29.28G                                     

  oralv    VolGroup00 -wi-a-  2.00G                                     

[root@oracle /dev/VolGroup00]#ls -l /dev/mapper/

total 0

crw------- 1 root root  10, 63 Mar  7 01:48 control

brw-rw---- 1 root disk 253,  0 Mar  7 01:49 VolGroup00-LogVol00

brw-rw---- 1 root disk 253,  2 Mar  7 01:48 VolGroup00-LogVol01

brw-rw---- 1 root disk 253,  1 Mar  7 01:49 VolGroup00-oraclelv

brw-rw---- 1 root disk 253,  3 Mar  7 01:48 VolGroup00-oralv

[root@oracle /dev/VolGroup00]#ls -l 

total 0

lrwxrwxrwx 1 root root 31 Mar  7 01:48 LogVol00 -> /dev/mapper/VolGroup00-LogVol00

lrwxrwxrwx 1 root root 31 Mar  7 01:48 LogVol01 -> /dev/mapper/VolGroup00-LogVol01

lrwxrwxrwx 1 root root 31 Mar  7 01:48 oraclelv -> /dev/mapper/VolGroup00-oraclelv

lrwxrwxrwx 1 root root 28 Mar  7 01:48 oralv -> /dev/mapper/VolGroup00-oralv

[root@oracle /dev/VolGroup00]#

when i was execute backup,it's indicate as below:

1 retry attempted

No full backups of this save set were found in the media database; performing a full backup

rawasm: VolGroup00-oralv: No such file or directory

:  Failed with error(s)

1 retry attempted

No full backups of this save set were found in the media database; performing a full backup

<< /dev/mapper >>: No such file or directory

:  Failed with error(s)

my os :centos6.3 x64

my networker:7.4.sp5 linux x64

who can help me?

thanks first!