Trying to solve generics error

I would like to know how could i initate the BaseDao class ?

public class BaseDao<TEntity, TIdentifier>
where TIdentifier : new()
where TEntity : BaseVo<TIdentifier>
{
//has implementation
}

public class BaseVo<TIdentifier>
    where TIdentifier : new()
{
    /// <summary>
    /// Gets or sets the Identifier.
    /// </summary>
    public virtual TIdentifier Id { get; set; }
}

I am trying to do

 public BaseDao<Department, int>  GetDepartmentRepository()
    {
       return new BaseDao<Department, int>();


    }

But getting the error - Kindly help The type 'Domain.Models.Entities.Department' cannot be used as type parameter 'TEntity' in the generic type or method 'Domain.Models.BaseDao'. There is no implicit reference conversion from 'Domain.Models.Entities.Department' to 'Domain.Models.BaseVo'.