UEFN VERIFICATION ERROR

I need your help. Could anyone tell me what the PDF thing means? I get all that stuff when I click on “Login,” and I don’t know what it means, but a moment ago everything was fine. If anyone could help me, please. I already lost an entire map because of it.[Verification error](file:///E:/unai/Documento%20sin%20t%C3%ADtulo.pdf)