Check if all the values are not null. Remember, that string can be nullable

This is a bummer, I am having the same issue. It looks like it is the first test case, but we can't see it.

I have the same error with C#
Did you get an answer to this?

There is no difference between "in dictionary order" and "alphabetic order", I think ;-)
About the code, I can't give you more help, unless you give more information about fails, or paste your code below(Mark as having spoiler content)