The code that was working yesterday suddenly stopped working.

The following error message was displayed Why is this?

Value of type 'List' has no member 'navigationTitle'

struct TopList: View {
  @ObservedObject var fetcher = ToplistFetcher()

  var body: some View{
    NavigationView{
      List{
        Section(header: Text("緊急連絡")){
          ForEach(0..<fetcher.toplistEmergencylists.count, id: \.self){ index in
            VStack(alignment: .leading){
              NavigationLink(destination: SecondView(t: fetcher.toplistEmergencylists[index].title)){
                VStack(alignment: .leading){
                  HStack{
                    Image(systemName: "doc.text")
                      .font(.subheadline)
                    Text(fetcher.toplistEmergencylists[index].title)
                  }
                  HStack(){
                    Image(systemName: "person.circle")
                      .font(.subheadline)
                    Text(fetcher.toplistEmergencylists[index].changer)
                  }
                  HStack{
                    Image(systemName: "calendar")
                      .font(.subheadline)
                    Text(fetcher.toplistEmergencylists[index].postdate.toStringWithCurrentLocale())
                  }
                }
              }
            }
          }
        }
        Section(header: Text("必読")){
          ForEach(0..<fetcher.toplistMustlists.count, id: \.self){ index in
            VStack(alignment: .leading){
              NavigationLink(destination: SecondView(t: fetcher.toplistMustlists[index].title)){
                VStack(alignment: .leading){
                  HStack{
                    Image(systemName: "doc.text")
                      .font(.subheadline)
                    Text(fetcher.toplistMustlists[index].title)
                  }
                  HStack(){
                    Image(systemName: "person.circle")
                      .font(.subheadline)
                    Text(fetcher.toplistMustlists[index].changer)
                  }
                  HStack{
                    Image(systemName: "calendar")
                      .font(.subheadline)
                    Text(fetcher.toplistMustlists[index].postdate.toStringWithCurrentLocale())
                  }
                }
              }
            }
          }
        }
        Section(header: Text("最近の投稿")){
          ForEach(0..<fetcher.toplistRecentlists.count, id: \.self){ index in
            VStack(alignment: .leading){
              NavigationLink(destination: SecondView(t: fetcher.toplistRecentlists[index].title)){
                VStack(alignment: .leading){
                  HStack{
                    Image(systemName: "doc.text")
                      .font(.subheadline)
                    Text(fetcher.toplistRecentlists[index].title)
                  }
                  HStack(){
                    Image(systemName: "person.circle")
                      .font(.subheadline)
                    Text(fetcher.toplistRecentlists[index].changer)
                  }
                  HStack{
                    Image(systemName: "calendar")
                      .font(.subheadline)
                    Text(fetcher.toplistRecentlists[index].postdate.toStringWithCurrentLocale())
                  }
                }
              }
            }
          }
        }
      }
      .navigationTitle("掲示板TOP")
      .listStyle(GroupedListStyle())
    }
  }
}