Cause
Name of a partition resulting from splitting of an existing table or index partition is identical to that of some other existing partition of that table or index
Name of a partition resulting from splitting of an existing table or index partition is identical to that of some other existing partition of that table or index
remove all VALUES LESS THAN clauses from descriptions of LOCAL index partitions
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm
https://community.oracle.com/message/4483176
https://community.oracle.com/message/4429376
Browse all solutions to database errors from Oracle, MS SQL, or MySQL