Index <str> already exists in this database or schema

  Explanation:  You attempted to create an index with the name of
  an existing index

  User Action:  In the precompiler and module language, this is
  just a warning.  If the index exists when you execute the
  statement, you will get a fatal error.  If you expect to drop
  the index before you execute this statement, then you do not
  need to make any changes.  In interactive, dynamic and runtime
  for precompiled and module language programs, this is a fatal
  error.  You must choose a different name.