Error Message
An unknown exception error is encountered when running very large drive times.
![[O-Image]](https://webapps-cdn.esri.com/CDN/support-site/technical-articles-images/000011160/00N39000003LL24-0EM39000000wdFm.png)
Cause
Business Analyst cannot process very large drive times using the detailed streets Network Analyst solver.
Solution or Workaround
Change the drive time solver from 'Detailed' to 'Hybrid'.
- In Business Analyst, click the toolbar and choose Preferences.
- In the Preferences dialog box, click the Dataset tab.
- Under Street Network, select the option to 'Use hybrid (performance and accuracy)'.
![[O-Image]](https://webapps-cdn.esri.com/CDN/support-site/technical-articles-images/000011160/00N39000003LL2C-0EM39000000wdFa.png)
- Click OK to close the Preferences dialog, and re-run the trade area analysis.