| Administrator | 
		This seems like a temp file not datafile. If it is a tempfile, this error is normal, as the tempfiles are not included in db/rman backups.
 Ensure it using v$tempfile, then drop the tempfile and add it back.
 
 Example command:
 
 alter database tempfile 'path-to-tempfile' drop
 alter tablespace your_TEMPTABLESPACE add tempfile 'path-to-tempfile' size 10G;
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