Some code

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using Cosmos.IL2CPU;
using Cosmos.IL2CPU.Plugs;
using Cosmos.Core;
using IRQContext = Cosmos.Core.INTs.IRQContext;

namespace Core
{
    [Plug(Target = typeof(Cosmos.Core.INTs))]
    public class INTs
    {
// STUFF
     }
}

Where did i go wrong?
I get error: http://i.imgur.com/k5v9SLx.png

[jp2masa]

Make sure you added a reference to IL2CPU and that the project with the plugs is referred by your Boot project

oh, ok. I will test it out.

And this handles the crashed right?

I made a new project called plugs in the core ring.
[assembly: Ring(Ring.Core)]
Here are the references:
http://i.imgur.com/VQhiYEX.png

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using Cosmos.IL2CPU;
using Cosmos.IL2CPU.Plugs;
using Cosmos.Core;
using Core;
using IRQContext = Cosmos.Core.INTs.IRQContext;

namespace Plugs
{
    [Plug(Target = typeof(Cosmos.Core.INTs))]
    public class INTs
    {
        public delegate void IRQ0called();
        public static IRQ0called onCalled = delegate { Core.PIT.called = true; };
        public static void HandleInterrupt_Default(ref IRQContext aContext)
        {
            if (aContext.Interrupt >= 0x20 && aContext.Interrupt <= 0x2F)
            {
                if (aContext.Interrupt >= 0x28)
                {
                    Global.PIC.EoiSlave();
                }
                else
                {
                    Global.PIC.EoiMaster();
                }
            }
        }

        public static void HandleInterrupt_00(ref IRQContext aContext)
        {
            Bluescreen.Init("Divide by zero Exception", "Get better at math.", true); 
        }

        public static void HandleInterrupt_01(ref IRQContext aContext)
        {
            Bluescreen.Init("Debug Exception", " ", true); 
        }

        public static void HandleInterrupt_02(ref IRQContext aContext)
        {
            Bluescreen.Init("Non Maskable Interrupt Exception", " ", true); 
        }

        public static void HandleInterrupt_03(ref IRQContext aContext)
        {
            Bluescreen.Init("Breakpoint Exception", " ", true); 
        }

        public static void HandleInterrupt_04(ref IRQContext aContext)
        {
            Bluescreen.Init("Into Detected Overflow Exception", "" , true); 
        }

        public static void HandleInterrupt_05(ref IRQContext aContext)
        {
            Bluescreen.Init("Out of Bounds Exception", " ", true); 
        }

        public static void HandleInterrupt_06(ref IRQContext aContext)
        {
            Bluescreen.Init("Invalid Opcode", " ", true); 
        }

        public static void HandleInterrupt_07(ref IRQContext aContext)
        {
            Bluescreen.Init("No Coprocessor Exception", " ", true); 
        }

        public static void HandleInterrupt_08(ref IRQContext aContext)
        {
            Bluescreen.Init("Double Fault Exception", " ", true); 
        }

        public static void HandleInterrupt_09(ref IRQContext aContext)
        {
            Bluescreen.Init("Coprocessor Segment Overrun Exception", " ", true); 
        }

        public static void HandleInterrupt_0A(ref IRQContext aContext)
        {
            Bluescreen.Init("Bad TSS Exception", " ", true); 
        }

        public static void HandleInterrupt_0B(ref IRQContext aContext)
        {
            Bluescreen.Init("Segment not present", " ", true); 
        }

        public static void HandleInterrupt_0C(ref IRQContext aContext)
        {
            Bluescreen.Init("Stack Fault Exception", " ", true); 
        }

        public static void HandleInterrupt_0E(ref IRQContext aContext)
        {
            Bluescreen.Init("Page Fault Exception", " ", true); 
        }

        public static void HandleInterrupt_0F(ref IRQContext aContext)
        {
            Bluescreen.Init("Unknown Interrupt Exception", " ", true); 
        }

        public static void HandleInterrupt_10(ref IRQContext aContext)
        {
            Bluescreen.Init("Coprocessor Fault Exception", " ", true); 
        }

        public static void HandleInterrupt_11(ref IRQContext aContext)
        {
            Bluescreen.Init("Alignment Exception", " ", true); 
        }

        public static void HandleInterrupt_12(ref IRQContext aContext)
        {
            Bluescreen.Init("Machine Check Exception", " ", true); 
        }

        // IRQ0
        public static void HandleInterrupt_20(ref IRQContext aContext)
        {
            Global.PIC.EoiMaster();
            PortIO.outb(0x20, 0x20);
            onCalled();
        }
    }
}

This is my whole code.

[jp2masa]

I think you shouldn't define a Ring in plugs projects and also only add plugs project reference to the Boot project, no project other than Boot

I removed the ring from the Plugs project and i only have it in Boot.
I still get the error:

2>F:\Users\Mihail\Documents\mihailos\Plugs\INTs.cs(36,6,36,10): error CS0246: The type or namespace name 'PlugAttribute' could not be found (are you missing a using directive or an assembly reference?)
2>F:\Users\Mihail\Documents\mihailos\Plugs\INTs.cs(36,6,36,10): error CS0246: The type or namespace name 'Plug' could not be found (are you missing a using directive or an assembly reference?)
2>F:\Users\Mihail\Documents\mihailos\Plugs\INTs.cs(36,11,36,17): error CS0246: The type or namespace name 'Target' could not be found (are you missing a using directive or an assembly reference?)

[jp2masa]

I verified that the namespace Cosmos.IL2CPU.Plugs exists in 2 assemblies: Cosmos.IL2CPU and Cosmos.IL2CPU.Plugs. Probably you are missing a reference to the second in your Plugs project.

I added the DLL.
It works 👍