node.js - Test backend functionality nodespostman error - Stack Overflow

I'm following a tutorial and I get This error:

Cannot read properties of undefined (reading 'env') node: internal/errors:496 ErrorCaptureStackTrace(err); I have searched Google but cannot find a solution i have seen in one searrch hat it could be a typo, I revisited all my code and can't seem to find any typo.

here is my controller code:

    //create post
    export const createPost = async (req, res) => {
      try {
        const { title, content } = req.body;
        const author = await User.findById(req.user.id);
        if (!title || !content) {
          throw errorHandler(404, "No title or content found!");
        }
        if (!author) {
          throw errorHandler(404, "No author found!");
        }
        const newPost = new Post({
          title,
          content,
          cover: req.file ? req.file.filename : null,
          author: author._id,
        });
        await newPost.save();
        res.status(202).json(newPost);
      } catch (error) {
        console.error(error.message);
        res.status(error.statusCode).json(error.message);
      }
    };
    
    //get all posts
    export const getAllPost = async (req, res) => {
      try {
        const posts = await Post.find()
          .populate("author", "username")
          .sort({ title: 1 });
        res.status(200).json(posts);
      } catch (error) {
        console.error(error.message);
        res.status(500).json("Internal server error: 500!");
      }
    };
    
    //get single post
    export const getSinglePost = async (req, res) => {
      try {
        const { id } = req.params;
        const postid = await Post.findById(id).populate("author", "username");
        if (!postid) {
          throw errorHandler(404, "Post not found!");
        }
        res.status(200).json(postid);
      } catch (error) {
        console.error(error.message);
        res.status(error.statusCode).json(error.message);
      }
    };
    
    //update post
    export const updatePost = async (req, res) => {
      try {
        const { id } = req.params;
        const { title, content } = req.body;
        const author = await User.findById(req.user.id);
        const post = await Post.findById(id);
        if (!post) {
          throw errorHandler(404, "Post not found!");
        }
        const updateObject = {
          title: title,
          content: content,
          cover: req.file ? req.file.filename : Post.cover,
        };
        const updatedPost = await Post.findByIdAndUpdate(id, updateObject, {
          new: true,
          runValidators: true,
        });
        if (!updatedPost) {
          throw errorHandler(404, "Post not found!");
        }
        res.status(200).json(updatePost);
      } catch (error) {
        console.error(error.message);
        res.status(error.statusCode).json(error.message);
      }
    };