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"Oh no! We encountered an error with your last submission."

Why am I getting an error? My code outputs exactly the same as the printChipmunksImperatively method, and I'm using a "forEach" to get my result. Is this because this course is wildly out of date? How can I get credit for this when I don't even know what I'm doing wrong?

Here's what I've got:

  public static void printChipmunksDeclaratively(List<String> chipmunks) {
    // TODO: Print out each of the chipmunks using the forEach method on Iterable
    chipmunks.forEach(chipmunk -> System.out.printf("%s! %n", chipmunk));