I am able to send CSV files as alerts, but when try to send a chart , I am getting the error
Failed taking a Screenshot message : process unexpectedly closed with status 255
For me, CSV files are sending without any problem, gecko driver version is 0.29, superset installed using docker compose.
There are many ways in which Alerts & Report setup can go wrong. For this I would suggest editing your docker-compose.yml file (or docker-compose-non-dev.yml if you're running in production, not development) to use the image 2.0.0-dev for your worker containers. That will include a functional setup of geckodriver and headless browser (Firefox) which should avoid a lot of the headaches that come from trying to install those yourself.
If your CSV reports are sending but not reports with images, this suggests a problem with the headless browser from the worker container trying to reach the report to take a screenshot.
The images you would use are:
apache/superset:2.0.0 for your superset containerapache/superset:2.0.0-dev for all other containersThe first change can happen in the superset part of the file:
image: apache/superset:2.0.0
The latter can be accomplished by changing this line near the top of the file to:
x-superset-image: &superset-image apache/superset:2.0.0-dev
Which will use that image for all other containers that aren't overridden as we did for the main superset container.