The error you're encountering is because Arrays.sort() doesn't return an array but instead sorts the array in place. So, you can't directly use Arrays.equals() to compare the sorted arrays. You need to sort the arrays first and then compare them.

OP solved it, closing

Because your convertion from int[] to List is wrong.

you're very welcome

seems like you passed the kata?

in which case, if your question was fully answered, close it out by clicking Mark question as resolved

at least this:

• you are missing the import for Arrays
• Java uses getNumericValue not NumericValue

and there is more, but start with these