Cause
User specified a value for db_nk_cache_size where n is one of {2, 4, 8, 16, 32}, but nk is not a valid block size for this platform.
User specified a value for db_nk_cache_size where n is one of {2, 4, 8, 16, 32}, but nk is not a valid block size for this platform.
Remove corresponding parameter from the "init.ora" file and restart the instance.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
https://community.oracle.com/message/694643
https://community.oracle.com/message/10024166
https://community.oracle.com/message/2694124
https://community.oracle.com/message/3805204
https://community.oracle.com/message/1977674
https://community.oracle.com/message/586447
https://community.oracle.com/message/9742131
https://community.oracle.com/message/1534063
https://community.oracle.com/message/10783624
https://community.oracle.com/message/6496621
Browse all solutions to database errors from Oracle, MS SQL, or MySQL