operation is not allowed on single-file databases

  Explanation:  An attempt was made to modify a single-file
  database in such a way that the root file would need to be
  expanded.  This type of change is not permitted for single-file
  databases.  Examples of database modifications that cause this
  error include the following:  reserving after-image journals or
  storage areas, adding or deleting storage areas, or changing the
  number of nodes or users.

  User Action:  If you want to create a multifile database from a
  single-file database, use the EXPORT and IMPORT statements.