Cause
Changes have been made to the database that require a newer software release or that violate the compatibility parameters.
Changes have been made to the database that require a newer software release or that violate the compatibility parameters.
Use a version of the software that can understand the changes or relax the compatibility requirements in the init file.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
https://community.oracle.com/message/1129451
https://community.oracle.com/message/612657
https://community.oracle.com/message/964843
https://community.oracle.com/message/796684
https://community.oracle.com/message/4040205
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