The parameter isn't defined however, I defined it - firebase

Question

The parameter isn't defined however, I defined it.
I saved my data onto firebase and also in the PostData object class however, when I try to fetch it, it tells me that the parameter isn't defined.
final FirebaseAuth _auth = FirebaseAuth.instance;
Future<void> fetchProducts() async {
PostData data;
final User user = _auth.currentUser;
final _uid = user.uid;
print('Fetch method is called');
await FirebaseFirestore.instance
.collection('post')
.get()
.then((QuerySnapshot productsSnapshot) {
_products = [];
productsSnapshot.docs.forEach((element) {
// print('element.get(productBrand), ${element.get('productBrand')}');
_products.insert(
0,
PostData(
0,
[],
Timestamp.now().millisecondsSinceEpoch,
name,
token,
image,
[],
title: element.get('productTitle'),
id: element.get('productId'),
description: element.get('productDescription'),
price: double.parse(
element.get('price'),
),
imageUrl: element.get('productImage'),
productCategoryName: element.get('productCategory'),
brand: element.get('productBrand'),
true,
// 0,
//
// [],
// Timestamp.now().millisecondsSinceEpoch,
//
// name,
// token,
// image,
// [],
// "",
// "",
// "",
// 0,
// "",
// "",
// "",
// true,
),);
});
});
}
Here is where I stored it, in PostData however, whenever I try to call it, it tells me that the parameter isn't defined. I am pretty sure I defined it so I don't know what to do or how to fix this issue.
PostData(
int likesCount,
List likes,
int timestamp,
String postersName,
String postersId,
String postersImageUrl,
List postSavedByUsers,
String title,
String id,
String description,
double price,
String imageUrl,
String productCategoryName,
String brand,
)
{
this.likesCount = likesCount;
this.likes = likes;
this.timestamp = timestamp;
this.postersName = postersName;
this.postersId = postersId;
this.postersImageUrl = postersImageUrl;
this.postSavedByUsers = postSavedByUsers;
this.title = title;
this.id = id;
this.description = description;
this.price = price;
this.imageUrl = imageUrl;
this.productCategoryName = productCategoryName;
this.brand = brand;
this.isPopular = isPopular;
}
here is the error i'm getting.

Answer 1

You're getting the error because you defined positional required parameters and not named parameters but you're trying to pass the name of the parameters (title, id, description, price, `imageUrl, productCategoryName, brand).
Solution:
Pass the arguments as positional required parameters (without the parameter names) like below:
PostData(
0,
[],
Timestamp.now().millisecondsSinceEpoch,
name,
token,
image,
[],
element.get('productTitle'),
element.get('productId'),
element.get('productDescription'),
double.parse(
element.get('price'),
),
element.get('productImage'),
element.get('productCategory'),
element.get('productBrand'),
)