As commented it seems to be cache issue. If you have made recently any changes to your db just try clearing your cache from folder /app/tmp/
.
Another trick to clear cache is,
- First change the debug level to 3 in your core.php file.
- Reload your application in browser.
- Change the debug level back to 0.
Remember: Any time you add a new model or adjust your associations or make changes in structure of your database table, be sure to delete the cache folder from the /app/tmp/
folder.