Last updated: 5 Feb 1999
This is an Approach v3.0* error message indicating a corrupt index (.adx file). Try compressing the database first, otherwise you will need to delete the .adx files. You should probably also check to see if you have any .oyz files and get rid of those as well.
NOTE: read articles 'Deleting and recreating index files (.adx)' and 'Repairing corrupt index (.adx) files' before deleting the .adx or .oyz files!
For compressing, see article 'Reducing ("Compressing") the size of a database file'