Hey melanie71, I have found the solution to the problem.
I am using miniOrange Social Login, Sharing. I searched a lot on the web for a solution until I took the following steps:
OBSERVATION AND RESOLVE
I logged into WordPress, went to the Plugin settings, under Social Login, and noticed that I get this error because I have not added any social network for the login, yet I enabled it.
The options you would see are:
Under Display Options
Select the options where you want to display the social login icons
– Default Login Form (this was checked in mine)
– Default Registration Form
– Comment Form
– WooCommerce Login Form
As soon as I unchecked “Default Login Form” and saved, the error disappeared.
Try that and you’ll be free from the error. Good luck!