If you are setting up DataView on your Confluence page for the first time, you might see this message appear
This is because the Add-on is processing your data for the first time. This normally takes a minute or two, depending on the size of your dataset and your server connection.
After a minute or two, you should see the link 'Refresh' appear at the top of the page text
Now, if you click on 'Refresh' your data will appear as expected.
This should only happen when you first upload data.