line <num> beyond line index on page

  Explanation:  An attempt was made to fetch a  line  on  a  page.
  The  fetch  failed  because  the  line index on that page has no
  entry for the requested line.  The problem is most likely caused
  by an invalid or corrupt pointer in an index.

  User Action:  Rebuild the index if the line is  referenced  from
  an index.