Hot backup ends with ORA-1466

hello all,

i have problem with my hot backup. Backup only put all tablespace to backup mode and copy datafiles to backup location using OS copy. Problem is that after putting tablespaces back to normal state i received ORA-1466 error. everytime.

hu Jun 04 01:01:53 2015

ALTER TABLESPACE SYSTEM END BACKUP

Completed: ALTER TABLESPACE SYSTEM END BACKUP

ALTER TABLESPACE SYSAUX END BACKUP

Completed: ALTER TABLESPACE SYSAUX END BACKUP

ALTER TABLESPACE UNDOTBS1 END BACKUP

Completed: ALTER TABLESPACE UNDOTBS1 END BACKUP

ALTER TABLESPACE CONTEXTINDEXDATA END BACKUP

Completed: ALTER TABLESPACE CONTEXTINDEXDATA END BACKUP

ALTER TABLESPACE INDEXDATA END BACKUP

Completed: ALTER TABLESPACE INDEXDATA END BACKUP

ALTER TABLESPACE RISDATA END BACKUP