There is another index named, <str>, in this database or schema

  Explanation:  This message is printed during an IMPORT operation
  if the backup file contains multiple definitions of an index.
  Duplicate definitions may indicate corruption of the
  interchange, or improper operation during the EXPORT operation.

  User Action:  Contact your Oracle support representataive.
  Retain a copy of the Oracle Rdb interchange file that caused the
  error.  Subsequent definitions of the index should be ignored
  during the IMPORT operation; your database may not be currupt.