Teradata Query Using Dapper C#

I am trying to dynamically query a Teradata database using Dapper but am having some issues. Here is the code:

// model variable is the parameter passed in with search information
using (IDbConnection con = new TdConnection(connection.GetConnectionString()))
{
    var builder = new SqlBuilder();
    var selector = builder.AddTemplate($"SELECT * FROM Temp_Table /**where**/");

    if (model.Id != 0)
    {
        builder.Where("Id = ?", new { model.Id });
    }

    if (!string.IsNullOrEmpty(model.Employee_Id))
    {
        builder.Where("Employee_Id = ?", new { model.Employee_Id });
    }

    var data= con.Query<TableModel>(selector.RawSql, model).ToList();
    return data;
}

The error I am getting is:

[Teradata Database] [3939] There is a mismatch between the number of parameters specified and the number of parameters required.

I have used very similar code to query DB2 which worked just fine; what do I need to do differently with Teradata?