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ORA-00372:

file string cannot be modified at this time
Cause: attempting to modify the contents of a file that cannot be modified. The file is most likely part of a read only tablespace but may be in the process of going offline, or the database may be in the process of closing.
Action: check the status of the file and its tablespace
 SubjectReplies
1.ORA-604/ORA-10921