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Object reference not set to an instance of an object


DjEnzo
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Hi guys,

after some hours of programming, I've got an error. This is my exception-log:

==================[28.12.2018 04:10:52]==================
System.NullReferenceException: Object reference not set to an instance of an object.
   at void GTV.Systems.Cargo.Core.AttachCargosToLoadings() in C:\Users\Kacper\Documents\GT-V\GTV\GTV\Systems\Cargo\core.cs:line 118
=========================================================

==================[28.12.2018 04:10:52]==================
System.Reflection.TargetParameterCountException: Parameter count mismatch.
   at object[] System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(object obj, BindingFlags invokeAttr, Binder binder, object[] parameters, CultureInfo culture)
=========================================================

Here's my console:

Step 1
Step 2
Step 3
Step 4, r: 1, c: 0, llc: 3
Step 5
[Cargo] Cargo destination has been set to 3
Step 6, 0
GTV.Systems.Cargo.Cargo

And here are the functions doing this staff:

...
public void AttachCargosToLoadings()
        {
            try
            {
                if (cargos_list.Count <= 0) throw new Exception("Brak towarów");
                if (loadings_list.Count <= 1) throw new Exception("Brak załadunków");
                int currentLoadingID = 0;
                NAPI.Util.ConsoleOutput("Step 1");
                foreach (Loading load in loadings_list)
                {
                    NAPI.Util.ConsoleOutput("Step 2");
                    for (var i=0;i<5;i++)
                    {
                        NAPI.Util.ConsoleOutput("Step 3");
                        int randomIndex = random.Next(cargos_list.Count - 1);
                        AttachDestinationToCargo(cargos_list[randomIndex],currentLoadingID);
                        NAPI.Util.ConsoleOutput("Step 6, "+randomIndex);
                        NAPI.Util.ConsoleOutput(cargos_list[randomIndex].ToString());
                        NAPI.Util.ConsoleOutput(cargos_list[randomIndex].GetType().ToString());
                        load.cargos.Add(cargos_list[randomIndex]);
                        NAPI.Util.ConsoleOutput("Step 7");
                        NAPI.Util.ConsoleOutput("[Cargo] Inserted Cargo ("+cargos_list[randomIndex].name+") to Loading ("+load.id+")", ConsoleColor.DarkGreen);
                        NAPI.Util.ConsoleOutput("Step 8");
                    }
                    currentLoadingID++;
                }
            }
            catch (Exception e)
            {
                NAPI.Util.ConsoleOutput("[Cargo] " + e.Message + " (Init Attach)", ConsoleColor.Red);
            }
        }

        public void AttachDestinationToCargo(Cargo cargo, int currentLoadingID)
        {
            int randomIndex = random.Next(loadings_list.Count - 1);
            while(randomIndex==currentLoadingID) {
                randomIndex = random.Next(loadings_list.Count - 1);
            }
            NAPI.Util.ConsoleOutput("Step 4, r: "+randomIndex+", c: "+currentLoadingID+", llc: "+loadings_list.Count);
            cargo.destination = loadings_list[randomIndex];
            NAPI.Util.ConsoleOutput("Step 5");
            NAPI.Util.ConsoleOutput("[Cargo] Cargo destination has been set to "+loadings_list[randomIndex].id, ConsoleColor.DarkCyan);
        }
...

Cargo class:

		public int id { get; set; }
        public string name { get; set; }
        public bool legal { get; set; }
        public string color = "#ffffff";
        public double money_multipler { get; set; }
        public double exp_multipler { get; set; }
        public int event_id = 0;
        public int courses = 0;
        public Loading destination { get; set; }

Loading class:

		public int id { get; set; }
        public Vector3 pos { get; set; }

        // Init cargos
        public List<Cargo> cargos { get; set; }

        //After InGame Create
        public Marker marker { get; set; }
        public ColShape colshape { get; set; }
        public Blip blip { get; set; }
        public TextLabel text { get; set; }

        bool error = false;

What Am I doing wrong? I really appreciate your help :)

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