Fixed.

kata isn't editable anymore, unfortunately. Closing.

It could be 3. Or 4. Or 5. Or {6,7,8,9}

Gah... I didn't notice that as well

Same problem

I think it's a problem with the platform, not the kata.

Oh, you're right. I'm talking about the Java version. I'll try to summarize all the problems when I can. Thanks.

If it's not ready, show the actual issues. After all, your issue might be in a specific language, which was added after the beta process.

This kata is not ready. How did it get through the beta?

Oh yeah, didn't think of that. Thanks!

You can always see what expr you are validating by adding System.out.println

Turns out that in the Java version, the Node class problem comes up only while running the preliminary tests. I used the 'Submit' button to test my code instead of 'Run Tests' and eventually figured it out. Hope this helps!

Same problem in Firefox

I'm failing the last test and the error message just says "1"

Make sure the data types match. I always screw up JavaScript katas with that mistake since I'm used to defining concrete data types in Java and not just vars.