'The webpage couldn’t be loaded' error when connecting to my home network on MacBook Pro

I’ve been trying to connect to my home network but every time I try i get “The webpage couldn’t be loaded.” It only shows this when I try to connect to my macbook, all my other devices have connected perfectly fine. Could this problem be caused my be connecting to a public wifi earlier?

[Re-Titled by Moderator]

Original Title: Trouble connecting to home network