Hi @Andrew Lu ,
Are you trying to follow this tutorial to learn SSAS and stop in Step2: Add data? And are you using On-Premise SQL Server database? If yes, please try to recreate a tabular project and set the Compatibility level to SQL Server 2016 RTM(1200), and then don't select all the table, just select one table for testing. If there is no error, you could start to import all table.
Best regards,
Carrin
If the answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.