DLL Failed to inject on API v1

IDE: Visual Studio 2017 Professional

.NET Framework: 4.6.1

Here's my problem:

I have WeAreDevs_API.dll as a reference. I type "using WeAreDevs_API;". I then type "ExploitAPI api = new ExploitAPI();", then use api.LaunchExploit. When I call the api.LaunchExploit, it says "DLL Failed to inject". I tried downloading the API again, but stumbled apon the same issue. Earlier, I was using Slurp, when I overwhelmed the game with hacks and had to restart my game. Once I logged into Slurp again, same issue happened. I even redownloaded Slurp.

Anyways, if anybody can help, that would be great!

Code:

using System;

using System.Windows.Forms;

using WeAreDevs_API;

namespace Italian_Silk

{

    public partial class Form1 : Form

    {

        ExploitAPI api = new ExploitAPI();

        public Form1()

        {

            InitializeComponent();

        }

        private void flatButton1_Click(object sender, EventArgs e)

        // flatButton1 is Inject button

        {

            api.LaunchExploit();

        }

    }

}