The error can be caused by a couple of reasons:
1. The viewer does not have a Google BigQuery account with all of the necessary access permissions to the data sources used in the view.
2. The publisher of the workbook has not embedded data source credentials during publishing for a Google BigQuery account with the necessary access permissions to the data sources used in the view.
I've seen a similar case in the past solved using the steps below:
1. Need to follow the Google article Quickstart Using the Web UI and create an empty project
2. Then connect using Tableau Desktop again.
Additionally, the article below provide two possible workaround options.
Hope this help.
thank you for your replay!
As I understand, I need a Google BigQuery Account. GDELT is not an open data, isn't it?
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According to Tableau blog article below you can sign up for a free GDELT BigQuery credential.
Hope this help