Oracle RMAN Backup error

Hello,

We appreciate any support on below :

I have configured Oracle RMAN Backup job but getting below error:

Recovery Manager19.19.0.0.0

RMAN>

Recovery Manager complete.
host command complete
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-06135: error executing host command: Additional information: 256

Recovery Manager complete.
The backup process failed:
RMAN exited with return code '1'.
Exiting with error:
RMAN exited with return code '1'.
RUH-STG-DB: RMAN exited with return code '1'.

24586:nsrdasv: RMAN exited with return code '1'.

  Looking forward for any support.