Google Forms - This form contains features which require sign in

Dears,

I created a Google Form with ability to upload file option. It works fine for me when I'm logged-in.

I have shared the link with my friends after making it public to all.

It keeps giving me the following message:

I make sure that "Requires sign in:" --> "Limit to 1 response" is NOT enabled.

Also, this Quiz is NOT enabled.

What's wrong?

Note that I'm using new version of Google Forms.