Visualizations don't work

I started power bi with a free license, and then I upgraded to the pro version. The thing is that I am still having the same problem as before, I can't view any visualization (couldn't retrieve the data for this visual, please try again later).

I was having the same problem before, but it was because my trial version expired, and now that I have the paid version, I don't know what's wrong.

Can someone please help me?

Thanks in advance.