Foursquare log in help

I’m trying to make an app for the wanderlust project but whenever I select the free plan, it tells me something is wrong and that I need to refresh and repeat. How do I fix this?

Hey there system4815721516;
can you share a screenshot of the problem you’re encountering?
I did that project a couple of weeks ago and didn’t encounter any problem signing up nor logging in to Foursquare.