I’m currently working with multer file upload in node js but i got an error something just like this:

This is my multer config:

const multer = require('multer')

/* Multer */
const FILE_TYPE_MAP = {
  'image/png': 'png',
  'image/jpeg': 'jpeg',
  'image/jpg': 'jpg'
}
const storage = multer.diskStorage({
  destination: function (req, file, cb) {
    const isValid = FILE_TYPE_MAP[file.mimetype]
    let uploadError = new Error('invalid image type')

    if (isValid) {
      uploadError = null
    }
    console.log("INSIDE MULTER");
    cb(uploadError, './public/admin/assets/images/offerproduct-images')
  },
  filename: function (req, file, cb) {
    const filename = file.originalname.split(' ').join('-')
    const extension = FILE_TYPE_MAP[file.mimetype]
    cb(null, `${filename.split('.')[0]}-${Date.now()}.${extension}`)
  }
})

const uploadOptions = multer({ storage: storage })

This is my router look like:

adminrouter.post(
  "/pressAddproduct",
  uploadOptions.array("productImg", 10),
  adminController.PressAddproductButton
);

The form in ejs:

<form id="productForm" action="/pressAddproduct" method="post" enctype="multipart/form-data">
                <div class="form-group">
                    <label for="productName">Name</label>
                    <input type="text" id="productName" name="productName" placeholder="Enter product name" required>
                </div>
                <div class="form-group">
                    <label for="productImg">Images</label>
                    <input type="file" id="productImg" name="productImg" accept="image/*" multiple required>
                </div>
                <div class="form-group">
                    <label for="description">Description</label>
                    <textarea id="description" name="description" rows="4" placeholder="Enter product description" required></textarea>
                </div>
                <div class="form-group">
                    <label for="stockQuantity">Stock Quantity</label>
                    <input type="number" id="stockQuantity" name="stockQuantity" placeholder="Enter stock quantity" required>
                </div>
                <div class="form-group">
                    <label for="category">Category</label>
                    <select id="category" name="category" required>
                        <% allcats.forEach(element => { %> 
                            <option value="<%= element._id %>"><%= element.name %></option>
                        <% }) %>
                    </select>
                </div>
                <div class="form-group">
                    <label for="brand">Brand</label>
                    <select id="brand" name="brand" required>
                        <% allbrands.forEach(element => { %>
                            <option value="<%= element._id %>"><%= element.name %></option>
                        <% }) %>    
                    </select>
                </div>
                <div class="form-group">
                    <label for="price">Price</label>
                    <input type="number" id="price" name="price" placeholder="Enter price" required>
                </div>
                <div class="form-actions">
                    <button type="submit">Add Product</button>
                </div>
            </form>

Can somebody tell me what the problem is because i’ve been messed up with this error for a day