If Twilio encounters a problem when running through the instructions in your application, we will log an error message for your project. You can see these error messages in your Error Logs. You can also set up alarms for these error messages so you will be alerted any time Twilio logs an error. Go to Error Logs page and click on the Create alarm + icon.

Configure the Trigger to fire based on your preferences. You can have Twilio hit a webhook or send an email:

When you navigate back to your Manage alarms page, you can see all the alarms you’ve set up for your project.