SQL mission 189 screen 2, possible technical error of website?

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Screen Link: https://app.dataquest.io/m/189/intermediate-joins-in-sql/2/joining-three-tables

My Code: select * from media_type limit 10

What I expected to happen: a quick preview of table with some rows printed out

What actually happened: nothing get printed out, no error message either

Other details: I also tried similar code such as select * from track limit 10 also no output.
I’ve tried other combinations with different select clause and order by clause, so far this is the only code that works properly for me: select * from invoice_line order by unit_price desc limit 10