c# app connecting to my mysql server

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C#

Hello, I have a problem, i`m trying to make an application that connects to my mysql db, but i get an error-Backend sent unrecognized response type: 8
How to solve this? Error pops up on connection.Open line.

Here the code
-

NpgsqlConnection conection = new NpgsqlConnection("Server=xxx;Port=3306;Database=xxx;User Id=xxx;Password=xxx;");

NpgsqlDataAdapter npgsqldataadapteris1 = new NpgsqlDataAdapter();
conection.Open();

Npgsql.NpgsqlCommand komanda = new NpgsqlCommand("INSERT INTO tournaments(majaskomanda,viesukomanda,mgoli, vgoli) VALUES(@mvalsts,@vvalsts,@mgoli,@vgoli)", conection);
//komanda.Parameters.AddWithValue("match_id", comboBox2.Text);
komanda.Parameters.AddWithValue("mvalsts", richTextBox1);
komanda.Parameters.AddWithValue("vvalsts", richTextBox1);
komanda.Parameters.AddWithValue("mgoli", richTextBox1);
komanda.Parameters.AddWithValue("vgoli", richTextBox1);

komanda.ExecuteScalar();
conection.Close();
}