Concurrency violation: the DeleteCommand affected 0 of the expected 1 records

I am trying to delete a record from a datagridview then updating it to a mysql server, however I keep receiving "Concurrency violation: the DeleteCommand affected 0 of the expected 1 records.". I have googled and messed around with it somewhat and cannot figure out a fix for love nor money. Where am I going wrong?

    private void Form1_Load(object sender, EventArgs e)
    {
        try
        {
            // create a connection to the server
            connection = new MySqlConnection("SERVER=" + Constants.SERVER + ";" + "DATABASE=" + Constants.DATABASE + ";UID=" + Constants.USERNAME + ";" + "PASSWORD=" + Constants.PASSWORD + ";");
            connection.Open();

            // create our default handler
            adapter = new MySqlDataAdapter();

            // set the default commands to do
            adapter.SelectCommand = new MySqlCommand("SELECT * FROM npc_drops", connection);
            MySqlCommand query = new MySqlCommand("DELETE FROM npc_drops WHERE id = @id", connection);
            query.Parameters.Add("@id", MySqlDbType.Int32, 10, "id");
            adapter.DeleteCommand = query;

            // create a table to put our data in and fill it with the results
            table = new DataTable();
            adapter.Fill(table);

            // bind both the data table and the datagridview togeather
            BindingSource source = new BindingSource();
            source.DataSource = table;
            dataGridView1.DataSource = source;
            dataGridView1.Columns["id"].Visible = false;
        }
        catch (MySqlException ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        try
        {
            table = table.GetChanges();
            adapter.Update(table);
        }
        catch (MySqlException ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

Table:

CREATE TABLE `n