I keep getting this error and I dont know how to reslove PLease help!! avl.java:319: error: cannot find symbol root=root.insert(root,nv); ^ symbol: method insert(Node,int) location: variable root of type Node 1 error class Solution {

 int Max(int a, int b)
{
    if(a>b)
    {
        return a;
    }
    else 
    {
        return b;
    }
}

  Node leftrot(Node x)
{
    Node y = x.right;
    Node t2 = y.left;

    y.left = x;
    x.right = t2;

    x.ht = Max(height(x.left),height(x.right)+1);
    y.ht = Max(height(x.left),height(x.right)+1);

    return y;
}
  Node rightrot(Node x)
{
    Node y = x.left;
    Node t2 = y.right;

    y.right = x;
    x.left = t2;

    x.ht = Max(height(x.left),height(x.right))+1;
    y.ht = Max(height(x.left),height(x.right))+1;

    return y;

}
 int height(Node n)
{
    if(n == null)
    {
        return 0;
    }
    return n.ht;
}
 int getBalance(Node node)
{
    if(node == null)
    {
        return 0;
    }
    return height(node.left) - height(node.right);
}

 Node insert(Node root,int data)
{
    if(root==null)
    {
         Node node = new Node();
        node.val = val;
        node.ht = 0;
        node.left = null;
        node.right = null;
        return node;
    }
    if(root.val < data)
    {
        root.right = insert(root.right, data);
    }
    else if(root.val > data)
    {
        root.left = insert(root.left, data);
    }
    else
    {
        return root;
    }
    root.ht = Max(height(root.left), height(root.right))+1;

    int balance = getBalance(root);

    if(balance > 1 && data < root.left.val)
    {
        return rightrot(root);
    }
    if(balance < -1 && data > root.right.val)
    {
        return leftrot(root);
    }
    if(balance > 1 && data > root.left.val)
    {
        root.left = leftrot(root.left);
        return rightrot(root);
    }
    if(balance < -1 && data < root.right.val)
    {
        root.right = rightrot(root.right);
        return leftrot(root);
    }
    return root;
}

    avl.java:319: error: cannot find symbol
    root=root.insert(root,nv);
             ^