WeAreDevs API not working??

Hello, i've been working on a exploit and decided to use WeAreDevs's API! But sadly I keep on getting a error when I run 

private void Form1_Load(object sender, EventArgs e)
{
    
}

private void button1_Click(object sender, EventArgs e)
{
    try {
        api.LaunchExploit();
    } catch (Exception ex)
    {
        MessageBox.Show("Fatal: API cant attach\n\n"+ex);
    }
}

The error says: System.ArgumentNullException: 'Value cannot be null.

Parameter name: value'