My mashup View page is blank screen instead of displaying data

So I was following the tutorial steps about how to connect kepware server to thingworx foundation.

Here is the link: https://developer.thingworx.com/en/resources/learning-paths/connect-and-monitor-plant-equipment/connect-kepware-server-thingworx-guide/visualize-data.

When I reached this last part of step 6: Visualise the data, I opened the view mashup in thingworx and this appeared. (the following image). It's empty and did not display any data and I have already confirmed the test connection to IndConn as they mentioned

Can someone help me out please?