Showing run time error

#1
#2

@Narasimha
it had syntax errors like you had defined no main file .refer to this corrected code:

#3

@Narasimha
//bottom view using recursion
import java.util.*;
import java.util.LinkedList;

public class Main {
static class Node {
Node left;
Node right;
int data;
}

static Node root;

private class Pair {
	int data;
	int l;

	public Pair(int data, int l) {
		this.data = data;
		this.l = l;
	}
}

public void topView(Node n1, TreeMap<Integer, Pair> t1, int dist, int level) {
	if (n1 == null) {
		return;
	}
	if (!t1.containsKey(dist) || level >= t1.get(dist).l) {
		t1.put(dist, new Pair(n1.data, level));
	}
	topView(n1.left, t1, dist - 1, level+1);
	topView(n1.right, t1, dist + 1, level+1);
}

public static void main(String[] args) {
	Main tree = new Main();
	Scanner obj = new Scanner(System.in);
	LinkedList<Node> l1 = new LinkedList<Node>();
	Node n1 = new Node();
	tree.root = n1;
	n1.data = obj.nextInt();
	l1.addLast(n1);
	while (!l1.isEmpty()) {
		Node temp = l1.removeFirst();
		if (temp.data != -1) {
			Node templ = new Node();
			templ.data = obj.nextInt();
			if (templ.data != -1) {
				temp.left = templ;
				l1.addLast(templ);
			} else {
				temp.left = null;
			}
			Node tempr = new Node();
			tempr.data = obj.nextInt();
			if (tempr.data != -1) {
				temp.right = tempr;
				l1.addLast(tempr);
			} else {
				temp.right = null;
			}
		}
	}
	TreeMap<Integer, Pair> t1 = new TreeMap<>();
	tree.topView(root, t1, 0, 0);
	for (int key : t1.keySet()) {
		System.out.print(t1.get(key).data + " ");
	}
}

}