Data Shuttle Not Working


Hi, I am facing troubles with one of Upload workloads created. I am using googlesheet as datasource to be uploaded to Smartsheet. It worked fine for a first time but then it stopped working and I see red explanation mark there. I am not able to figure this out.

Also - if I want to upload data as per googlesheet tab with a pivot table, I am not getting anything. Is that because of pivot table?

Thanks for any hint!