Gmail::SendEmail error - Failed to fetch data from external service

I have set an ‘Automation task’ that triggers everyday and emails a list of tasks.

But when the task is run i get an email with the below error:

Rule “Email Daily Tasks” failed to run.

When I look at the job history in Coda I see the below message:

Gmail::SendEmail failed - Failed to fetch data from external service.

Anyone knows how I can debug this or can guide on what Im doing wrong?
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