root dbkey of B-tree is <num>:<num>:<num>

  Explanation:  An error occurred at a lower level in the  B-tree.
  This  error  message gives the root dbkey of the B-tree index to
  help determine the point of corruption.

  User Action:  Use this information to reconstruct the path  from
  the  root  to  the node where the problem occurred and determine
  the location of the problem.  Rebuild the index and  verify  the
  database again.