ERROR: dereferencing pointer to incomplete type

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>


typedef struct Node
{
    int info;
    struct node* left;
    struct node* right;
}node;

void insert(node *root,int item)
{
    node *parent,*cur;
    parent=NULL;
    cur=root;
    while(cur!=NULL)
    {
        parent=cur;
        if(item<=cur->info)
        cur=cur->left;
        else
        cur=cur->right;
    }
    if(parent==NULL)
    {
        root->info=item;
        root->left=NULL;
        root->right=NULL;
    }
    else if(item<parent->info)
    {
        node *newNode=(int*)malloc(sizeof(node));
        newNode->info=item;
        newNode->left=NULL;
        newNode->right=NULL;
        parent->left=newNode;
    }
    else
    {
        node *newNode=(int*)malloc(sizeof(node));
        newNode->info=item;
        newNode->left=NULL;
        newNode->right=NULL;
        parent->right=newNode;
    }
}


int main()
{
    node *root=(node*)malloc(sizeof(node));
    root->info=6;
    root->left=NULL;
    root->right=NULL;
    insert(root,4);
    printf("%d",root->left->info);
    getch();
}