Cause
The installer could not detect a single-instance database that could be upgraded.
The installer could not detect a single-instance database that could be upgraded.
None
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/dbinstaller_errormessages.htm
https://community.oracle.com/message/9400369
https://community.oracle.com/message/9400368
https://community.oracle.com/message/9400367
https://community.oracle.com/message/9400365
https://community.oracle.com/message/9366114
https://community.oracle.com/message/4525911
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