Converting Dictionary

I want to assign values ​​to properties in my own class with automapper from the list I have. But it gives an error while giving value to reference type in clash.

json data; {recid: 182, MyBirim: {id: 37, text: "TUZLA"}, LokasyonAdi: "aaaaa", LokasyonAdresi: "bbbb"}

my database tables;

    public MyInternetHatlari Convert(IDictionary<string, object> source,
        MyInternetHatlari destination,
        ResolutionContext context)
    {
        if (destination is null)
        {
            destination = new MyInternetHatlari()
            {
                İl = "ISTANBUL",
                CreatedDateTime = DateTime.Now,
                UserId = _httpContext.User.Identity.GetUserId()
            };
        }

        Type type = destination.GetType();

        IEnumerable<KeyValuePair<string, object>> keyValuePairs =
            source.Where(x => x.Key != "recid" && !x.Key.EndsWith("Id"));

        foreach (var (key, value) in keyValuePairs)
        {
            var propertyInfo = type.GetProperty(key);

            if (propertyInfo is null) continue;

            if (propertyInfo.PropertyType.Namespace is not null &&
                propertyInfo.PropertyType.Namespace.StartsWith("System"))
            {
                Type t = Nullable.GetUnderlyingType(propertyInfo.PropertyType) ?? propertyInfo.PropertyType;

                object safeValue = System.Convert.ChangeType(value, t);

                propertyInfo.SetValue(destination, safeValue, null);
            }
            else
            {
                var job = JObject.Parse(value.ToString()).ToObject<SortedDictionary<string, object>>();

                #region valuetype

                var propinfo = type.GetProperty(key + "Id");

                if (propinfo is not null)
                {
                    Type t = Nullable.GetUnderlyingType(propinfo.PropertyType) ?? propinfo.PropertyType;

                    object safeValue = System.Convert.ChangeType(job["id"], t);

                    propinfo.SetValue(destination, safeValue, null);
                }

                #endregion

                #region referancetype

                Type proptype = propertyInfo.PropertyType;

                if (proptype is null) continue;

                DataTable dataTable = _db.DataTable("SELECT TOP (1) * from " + key + " where Id=" + job["id"]);

                for (int i = 0; i < dataTable.Rows.Count; i++)
                {
                    foreach (PropertyInfo pi in proptype.GetProperties().Where(p => p.PropertyType.IsSerializable))
                    {
                        object row = dataTable.Rows[i][pi.Name];

                        Type tt = Nullable.GetUnderlyingType(pi.PropertyType) ?? pi.PropertyType;

                        object sv = System.Convert.ChangeType(row, tt);

                        //error TargetException: Object does not match target type.
                        pi.SetValue(proptype, sv, null);
                    }
                }

                propertyInfo.SetValue(destination, proptype, null);

                #endregion
            }
        }

        return destination;
    }

"TargetException: Object does not match target type" on this line. Gives a fault. pi.SetValue(proptype, sv, null);

I get this error when I try to change the values ​​of the relational table. I tried using Activator.CreateInstance to my relational class instead, it works but I can't "attach" with ef core.