Problem adding images within topics (Blogs, Files)

When you make a topic without adding pictures inside it, it is saved, but when adding pictures, this error appears 

  • Form is missing __token or __ts fields



I have disabled all the extension but the problem is still there until I also updated the script from version 3.3.16 To3.3.20 but the problem still exists

  • I did a simple procedure to check if the problem was in the site files or on the server side, which is that I have another site on the hosting and found that there was the same problem. Something is back to the way it was, but I can't figure out the source of the error. Please help, thank you