ORA-27021
        sequential file handle must be specified
        
        
        Cause
        The filename which will be passed to sbtopen was not specified.
        Action
        Specify a filename and continue.  If this is a backup set being created via Recovery Manager, use the 'format' option to specify the backup piece handle name.
        
     
    
    
        ORA-27021
        sequential file handle must be specified
        
        
        Cause
        The filename which will be passed to sbtopen was not specified.
        Action
        Specify a filename and continue.  If this is a backup set being created via Recovery Manager, use the 'format' option to specify the backup piece handle name.
        
     
    
    
        ORA-27021
        sequential file handle must be specified
        
        
        Cause
        The filename which will be passed to sbtopen was not specified.
        Action
        Specify a filename and continue.  If this is a backup set being created via Recovery Manager, use the 'format' option to specify the backup piece handle name.