Error when refreshing datasets from Amazon Redshift

Hi!  I'm using SAP Lumira (version 1.29.2 Build 97).  I've created a document using the Amazon Redshift JDBC connection (Query with SQL).  I have added 3 datasets to my document.

When I try to refresh the datasets, I get an error:  "Amazon Redshift: Unable to connect.  Check your data access driver.".  See attached screen shot.

However, I can add new data sets from the same connection to the same document, or any new document.

I have tried to save the document, close Lumira, and then reopen Lumira and the document and try to refresh and still will not refresh.  But adding a new data set from same connection works.

How can I refresh datasets within a document?

Thanks!