mahendra commented on issue #5294: Scheduled email reports for Slices / 
Dashboards
URL: 
https://github.com/apache/incubator-superset/pull/5294#issuecomment-407942207
 
 
   @YHGui - the error just indicates that the task took more than 120 seconds 
to run. It could have been stuck in either getting the dashboard data or in 
sending email. 
   
   1. Hope you set `WEBDRIVER_BASEURL` to the right public URL which is 
accessible from the celery process.
   2. Can you try invoking the `utils.send_email_smtp` from `superset shell` 
and see if mails are getting delivered?
   
   Instructions for headless firefox on centos is as follows
   `yum install -y firefox`
   
   and install `geckodriver` from 
https://github.com/mozilla/geckodriver/releases 

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