Unable to get contacts,SitecoreXConnectClientConfiguration.GetClient() throwing an exception

Question

I'm trying to get the contacts but while creating an instance of xconnect client, I'm getting the following exception:

Type must have a parameterless constructor (not necessarily public) or a public constructor that only takes parameters that correspond to primitive types

Here is the pseudo code for reference.

using (XConnectClient client = SitecoreXConnectClientConfiguration.GetClient())
        {
          List<Contact> contacts = null;
          contact = client.Get<Contact>(new IdentifiedContactReference(AssemblyFacetInformation.ContactReference, "bcc746fa19cd6fddf0203aa443eebd11"), new ContactExecutionOptions(new ContactExpandOptions(AssemblyFacetInformation.ContactReference)));
          var contact = contacts.FirstOrDefault();
          var assemblyFacetInformation = contact.GetFacet<AssemblyFacetInformation>(AssemblyFacetInformation.Timezone);
          assemblyFacetInformation.TimeZone = windowsTimeZone;
          client.SetFacet(contact, AssemblyFacetInformation.Timezone, assemblyFacetInformation);
          client.Submit();

        }

My Custom model class

public class AssemblyFacetCollectionModel
  {
    public static XdbModel Model { get; } = BuildAssemblyModel();
    static XdbModel BuildAssemblyModel()
    {
      XdbModelBuilder xdbModelBuilder = new XdbModelBuilder("AssemblyFacetInformation", new XdbModelVersion(1, 0));
      xdbModelBuilder.ReferenceModel(CollectionModel.Model);
      xdbModelBuilder.DefineFacet<Contact, AssemblyFacetInformation>(AssemblyFacetInformation.DefaultFacetKey);
      return xdbModelBuilder.BuildModel();
    }
  }

This is my facet class

[FacetKey(DefaultFacetKey)]
  [Serializable]
  public class AssemblyFacetInformation : Facet
  {
    public const string IdentifierCookieName = "_assembly_visitor_id";
    public const string AnalyticsCookieName = "analytics_uuid";
    public const string MetroCookieName = "metro";
    public const string ContactReference = "Assembly_Visitor";
    public const string DefaultFacetKey = "AssemblyFacetKey";
    public const string Timezone = "Timezone";
    public AssemblyFacetInformation() { }

    [JsonProperty("metro")]
    public Metro metro { get; set; }
    [JsonProperty("geolocated_location")] //From "metro" Cookie
    public string GeoLocation { get; set; } //From "metro" Cookie
    [JsonProperty("distance_from_metro")]
    public float DistanceFromMetro { get; set; } //From "metro" Cookie
    [JsonProperty("latitude")]
    public float UserLatitude { get; set; } //From "metro" Cookie
    [JsonProperty("longitude")]
    public float UserLongitude { get; set; } //From "metro" Cookie
    [JsonProperty("prioritize_online")]
    public bool PrioritizeOnline { get; set; } //From "metro" Cookie
    //[JsonProperty("metro")]
    //public string ShopSession { get; set; } //From "_shop_session" Cookie
    [JsonProperty("time_zone")]
    public TimeZoneInfo TimeZone { get; set; }

  }

While debugging the process I found that exception originally thrown by the AssemblyFacetCollectionModel class on this line

      return xdbModelBuilder.BuildModel();

Did I miss something or doing anything wrong??

Answer 1

The issue is with Metro and TimeZoneInfo types.

Either remove them or make sure that they are registered properly in your model and have proper constructors.

Read more about type restrictions here:

https://doc.sitecore.com/xp/en/developers/91/sitecore-experience-platform/the-xconnect-model.html