You’ve changed something in your Tabular model and you’re facing an ugly “Error: Object reference not set to an instance of an object.” message, don’t rush. Just go to the table you’ve made some changes and click on “Partitions” button.
Then click “Refresh Preview” button and click OK.
All done!
Thank you so much for this! The error is obviously not very helpful, and this saved me a lot of time. I really appreciate it.