Datarefresh is failing

I see the data refresh is failing all of a sudden from yesterday with error “Error details: [Simba]AthenaJDBC An error has been thrown from the AWS Athena client. INVALID_FUNCTION_ARGUMENT: Index must be greater than zero” I am not sure why this happening all of a sudden, it was working fine before, the issue started from 5 PM yesterday. Any insights ? I am able to run the same query manually in Athena

Try refreshing the dataset and check check the athena query history and find the failed query. It could be that the dataset has some calculated fields that are causing the issue. I suspect some string function is using slice() with incorrect indexes. But locating the actual query being run on athena should give you a good indication into where the issue lies.