Solution for no mapping exists from object type system.collections.generic.list while passing table valued parameter in store procedure

See more:

DataTable

DataAdapter

C#6.0

These are two class files

public class Salary
{
    .
    .
    .
    public List<TripAllowanceDT> tripAllowancedt { get; set; }

}


public class TripAllowanceDT
{
    public int id { get; set; }
    public string BookingNumber { get; set; }
    public int NewBookingId { get; set; }
    public string TripAllowance { get; set; }
    public DateTime MultidayFromDate { get; set; }
    public int EmployeeId { get; set; }
}

This is the code for calling a stored procedure

  SqlConnection conn = new SqlConnection();
              conn.ConnectionString = ConfigurationManager.ConnectionStrings["DBConnect"].ConnectionString;
              conn.Open();
              SqlCommand sc = new SqlCommand("SP", conn);

sc.Parameters.AddWithValue("AllowanceDT", EmployeeSalary.tripAllowancedt);
             DataTable dt = new DataTable();
              SqlDataAdapter da = new SqlDataAdapter(sc);
              sc.CommandType = CommandType.StoredProcedure;
              da.Fill(dt);

What I have tried:

I have tried for another method and it is working there, I have debugged the code and check values in it with data type as well. And it's all fine.
I have also removed code for the table-valued parameter from the stored procedure.
I have just declared i.e

@AllowanceDT TableType_UpdateAllowance ReadOnly