Hi Xinchao, let's see if I understand you correctly. You couldn't refresh the table structure for some unknown reason and you removed the table from the universe. Right? That is the reason why your report is not working. Each object in the universe is identified by its CUID which is an unique ID. When you remove a table, the objects from that table will be lost. And when you recreate the objects, they will have totally different CUID that the report does not recognize.
Now, I don't understand the part that you said you couldn't add the table back to the universe? what error message did you get? And you can refresh table structure now? Please explain.