Error message: "Cannot complete scan on index kind, id of database ... "

If you get this error message, it means that your database's index file has somehow become corrupted.

Fortunately, the solution is simple.

1. Quit CatBase, or CatBase Server if you are using the multi-user version of CatBase.
2. Open the folder that contains your CatBase database (this is the file with the .4DD file extension).
3. In the same folder as your database, you will find some related files, such as:
1. yourdatabase.4Dindx
2. yourdatabase.Match
4. DELETE the file that has the ".4Dindx" file extension. For example, if your database is called "catalog.4dd", then your index file will be called "catalog.4Dindx".
5. Now restart CatBase (or CatBase Server). The index file will automatically be re-created.

TIP: 

If you are using CatBase Single-User, you can easily find your database files. Just go to the File menu and choose Show Database Location.