No, a recursive solution will not cause that error, it is a Codewars issue, not a kata issue, retry later on, it usually sorts itself out.

I'm getting a "error: cannot find symbol assertEquals" error when running in Java, but the code works fine in Eclipse. I'm using a recursive solution and a function outside the persistence function to obtain the counter variable, could that be the problem?

The Swift version of this kata is 3.1.1. I've made a solution that works here, so it's not broken. Make sure you're not using things that don't work on 3.1.1.

I am getting the expected output in XCode's playground but not in the website's editor. Is there an issue coding with Swift?