Failed taking a screenshot Message: Process unexpectedly closed with status 2 & Failed taking a screenshot Message: Argument --marionette can't be set via capabilities

[AnanduB]

I have been getting the below message when I tried to send a chart as PNG through superset alert,

Failed taking a screenshot Message: Process unexpectedly closed with status 2

Then I have created a new virtual environment and installed superset again, then getting the below one,

Failed taking a screenshot Message: Argument --marionette can't be set via capabilities

Email alerts are working if I sent table as CSV, If I try to sent a chart or dashboard as visualizations, getting the above.

Could someone please help