Take a look at class %SYS.Task.
All the properties you need to be able to assess whether a task has run and when the next run datetime will be, are there. Some of the property names are not that obvious so you might run a query against that class and then compare what you get with what you see in the Ensemble Task Scheduler.
Take a look at class %SYSTEM.Encryption, it's all there.
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The opening and closing square brackets, [], already indicates that you are getting back an array of errors, in this case the array has 1 element.