_TypeError (type 'newsPostDetails' is not a subtype of type 'newsPostDetails' )

Question

Getting error

"_TypeError (type 'newsPostDetails' is not a subtype of type 'newsPostDetails' where newsPostDetails is from package:iona_central/Screens/Admin/NewsPostDetails.dart newsPostDetails is from package:iona_central/Screens/Admin/newsPostDetails.dart )" when running.

Firebase uploads work completly, but app has an exeption occuring.

_getNewsPostDetails (place where error is occuring is line 3)

_getNewsPostDetails() async {
    print("_getPostDetails now running... ");
    await DatabaseService()
        .getNewsPostDetails(widget.newsPostId)
        .then((newsPostId) {
      setState(() {
        NewsPostDetails = newsPostId;
        print("Newspost Details = " + newsPostId);
        _isLoading = false;
        print("_isLoading now is false!");
      });
    });

getNewsPostDetails Code (Databaseservices)

Future getNewsPostDetails(String newsPostId) async {
    QuerySnapshot snapshot = await FirebaseFirestore.instance
        .collection('newsPosts')
        .where('newsPostId', isEqualTo: newsPostId)
        .get();
    final newsPostData = snapshot.docs[0].data()! as Map<String, dynamic>;
    newsPostDetails? postDetails = newsPostDetails(
      newsPostTitle: newsPostData['newsPostTitle'] as String?,
      newsPostContent: newsPostData['newsPostContent'] as String?,
      date: newsPostData['date'] as String?,
    );
    print("getNewsPostDetails Complete");
    return postDetails;
  }