Help with MySql

[ig55555or]

I installed the Muscle library from NuGet manager
How to fix this error? thanks  

			string connStr = "server=localhost;user=admin;database=rage;password=1;";
            string sql = "INSERT INTO base (a,b,c,d,e)" + "VALUES(2, 'логин', 321, пароль', 9999)";
            MySqlConnection con = new MySqlConnection(connStr);
            MySqlCommand cmd = new MySqlCommand(sql, con);
            con.Open();
            cmd.ExecuteNonQuery();

 

And I have second question, why fix this? 

Message from console: 

WARNING: "SetPlayerNametagVisible" function is not implemented yet.
DEPRECATE: SetPlayerNametag is deprecated.

Thank you in advance.