❔ Name "PostsService" does not exist in the current context

@using BlazorBookGroup.Data
. . .
    private PostsService postsService = new();

    protected override void OnInitialized() => posts = postsService.GetPosts();

@using BlazorBookGroup.Data
. . .
    private PostsService postsService = new();

    protected override void OnInitialized() => posts = postsService.GetPosts();