分配时不兼容的类型,从BSTNode *到BSTNode *

warning C4133: '=' : incompatible types - from 'BSTNode *' to 'BSTNode *'

我在代码的第22,25,36和36行收到了这些警告.我也收到警告警告C4133：’function’：不兼容的类型 – 在我的两个递归调用中从’BSTNode *’到’BSTNode *’.我在下面的代码中用注释标记了错误.这些是相同的类型,所以我无法弄清楚导致这些警告的原因.

//BST.c

#include "BST.h"
#include <stdio.h>
#include <stdlib.h>


void insert(BSTNode* top_of_bst,BSTNode* node){


   //no items in bst,add it to the top
   if (top_of_bst == NULL){
      top_of_bst->node_value = node->node_value;
      top_of_bst->left = NULL;
      top_of_bst->right = NULL;
      top_of_bst->parent = NULL;
      return;
   }

  //if the value is smaller check the left child
  if (top_of_bst->node_value >= node->node_value){
      if (top_of_bst->left == NULL){
         node->parent = top_of_bst;  //HERE IS AN ERROR
         node->right = NULL;
         node->left = NULL;
         top_of_bst->left = node;   //HERE IS AN ERROR
         return;
      }
      //if the left child exists,recurse left
      else
         insert(top_of_bst->left,node);  //HERE IS AN ERROR
   }
   //if the value is bigger check the right child
    else{
       if (top_of_bst->right == NULL){
          top_of_bst->right = node; //HERE IS AN ERROR
          node->parent = top_of_bst;   //HERE IS AN ERROR
          node->left = NULL;
          node->right = NULL;
          return;
       }
       //if the child exists,recurse right
       else
          insert(top_of_bst->right,node);   //HERE IS AN ERROR
    }
}

这是我的BstNode头文件

#ifndef BSTNODE_H
#define BSTNODE_H

typedef struct BSTNODE{
   struct BSTNode* parent;
   struct BSTNode* left;
   struct BSTNode* right;
   int node_value;
}BSTNode;

#endif