RMAN-12001
        could not open channel string
        
        
        Cause
        An ALLOCATE CHANNEL command could not be processed.
        Action
        This message should be accompanied by other error message(s) indicating the cause of the error.
        
     
    
    
        RMAN-12001
        could not open channel string
        
        
        Cause
        An ALLOCATE CHANNEL command could not be processed.
        Action
        This message should be accompanied by other error message(s) indicating the cause of the error.
        
     
    
    
        RMAN-12001
        could not open channel string
        
        
        Cause
        An ALLOCATE CHANNEL command could not be processed.
        Action
        This message should be accompanied by other error message(s) indicating the cause of the error.