TSM 备份故障问题

sm 备份时报错：

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on tdp1 channel at 11/26/2010 05:05:38
ORA-19506: failed to create sequential file, name="1plsa111_1_1", parms=""
ORA-27028: skgfqcre: sbtbackup returned error
ORA-19511: Error received from media manager layer, error text:
   ANS1352E (RC52)   The session is rejected. Your password has expired.