duplicate B-tree node not found at dbkey <num>:<num>:<num>

  Explanation:  A duplicate B-tree index node was expected at  the
  given  dbkey,  but  was not found.  The pointer to the duplicate
  node in the B-tree is probably corrupt.

  User Action:  Ascertain if the  index  is  corrupt  by  manually
  verifying  related  index  nodes  after  dumping  pages  of  the
  database.  Rebuild the index if it is corrupt.