Once CRON Expression Has Error, Server Never Startup

To reproduce the problem:

1. Add a schedule with the following CRON expression:
0 0 4-1 * * ?
2. Restart the Continuum server.
3. The server never start up.

To workaround the problem:

1. Use JDBC to dig int he database and fix the CRON expression:
0 0 4-23 * * ?
2. Start the Continuum server.
3. Server starts successfully.