Cause
Cannot open the control file.
Cannot open the control file.
Check to make sure the control file exists and is not locked by some other program.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
http://docs.oracle.com/cd/E16655_01/server.121/e17640/rman.htm
https://community.oracle.com/message/2469000
https://community.oracle.com/message/4010767
https://community.oracle.com/message/2231786
https://community.oracle.com/message/2231845
https://community.oracle.com/message/10455545
https://community.oracle.com/message/3997417
https://community.oracle.com/message/1215557
https://community.oracle.com/message/9925715
https://community.oracle.com/message/4468889
https://community.oracle.com/message/11156335
https://community.oracle.com/message/9869279
https://community.oracle.com/message/9720560
https://community.oracle.com/message/3698477
https://community.oracle.com/message/9334915
https://community.oracle.com/message/9756098
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