Why, if not logged into Facebook, trying to share through a message results in an error on the login form?

Question

Facebook

Good time everyone. Can you please tell me what I missed in the application settings in Facebook Developers?
If the user is not previously logged in, then when trying to share through the message, it results in an error on the FB login form.

Subsequent login redirects to the normal share form to share the link on the wall.
If the user is previously logged in to FB, then the link share form opens by sending a personal message.
How to get rid of an error on the form, given that the link to the site and App's Domain are filled in?
ps for balls, use a link like
https://www.facebook.com/dialog/send?app_id=```***...