Why doesn't my Node class work with java.util.LinkedList

Question

So I'm trying to solve one of the LeetCode questions using a LinkList however when I try to add a node (Node q = new Node();) it wasn't working. So I made a Node class and put it in a package. It still gives me an error (Node q = new Node(); symbol: class Node) when I'm trying to compile it.
Here is my Node class:

package newpackage; 
public static class Node<E> {
    E item;
    Node<E> next;
    Node<E> prev;

    Node(Node<E> prev, E element, Node<E> next) {
        this.item = element;
        this.next = next;
        this.prev = prev;
    }
}

and here is the problem that I'm trying to solve:

import stdlib.*;
import dsa.*;
import java.util.*;
import newpackages.*;
public class TwoNum {
public static LinkedList addTwoNumbers(LinkedList<Integer> l1, LinkedList<Integer> l2) {
    Node q = new Node();
    q = l1;
    node p = new node();
    p = l2;
    LinkedList<Integer> end = new LinkedList<>();
    while (q != null && p != null) {
        int sum = 0;
        int caryy = 0;
        int x = p.element();
        int y = q.element();
        if (p == null) {
            x = 0;
        }
        if (q == null) {
            y = 0;
        }
        sum = x + y + caryy;
        caryy = sum / 10;
        end.addFirst(sum % 10);
        p = p.next();
        q = q.next();
    }
    return end; 
}
public static void main(String[] args) {
    LinkedList<Integer> a = new LinkedList<Integer>();
    LinkedList<Integer> b = new LinkedList<Integer>();
    LinkedList<Integer> c = new LinkedList<>();
    a.add(2);
    a.add(4);
    a.add(3);
    b.add(5);
    b.add(6);
    b.add(4);
    c = addTwoNumbers(a,b);
    node m = c;
    while (m != null){
        StdOut.print(m.element());
        m = m.next();
    }
    StdOut.println();
}

I would really appreciate it if anyone can help me with this.