Hackerrank fix your code in provided Solution for c#, throws error

This is throwing error from hackerrank side code part . needs to be fixed from there part

Here is my C++ solution, you can watch the explanation here : https://youtu.be/jCPAp_UIzAs

SinglyLinkedListNode* insertNodeAtPosition(SinglyLinkedListNode* llist, int data, int position) {
    SinglyLinkedListNode* newNode = new SinglyLinkedListNode(data);
    if(position == 0) {
        newNode->next = llist;
        return newNode;
    }
    SinglyLinkedListNode* curr = llist;
    while(position - 1) {
        position--;
        curr = curr -> next;
    }
    newNode -> next = curr->next;
    curr->next = newNode;
    return llist;
}

The provided classes for C# do not compile. This needs to be fixed.

Apparently I can't debbug my code because there is offuscated code that has an error that I CAN'T EDIT, for Java 8 it dosen´t work.

Solution: I suggest you to delete the class Result{} <-- including the brackets and leave only the method declared as public static