inconsistent accessibility error

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C#

I defined two class : 1- robi 2- police .in this thread program police should catch robber.
in Form1.cs I defined array of police object and robi object .compiler say me :

Error 1:
Inconsistent accessibility: field type 'WindowsFormsApplication1.police[]' is less accessible than field 'WindowsFormsApplication1.Form1.pol'

Error 2:
Inconsistent accessibility: field type 'WindowsFormsApplication1.robi[]' is less accessible than field 'WindowsFormsApplication1.Form1.rob'

All thing in form1.cs[design] is public.

this in my code:

police class:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    class police
    {
        public int number;
        public int x;
        public int y;
     
    
        public police(int X, int Y, int num)
        {
            var form = Form.ActiveForm as Form1;
            x = X;
            y = Y;
            number = num;      
        }

        public void Move()
        {
            bool bol = true;
            int target = 0;
            Random rand = new Random();
            var form = Form.ActiveForm as Form1;
            for (int i = 0; i < Convert.ToInt32(form.textBox2.Text); i++)
            {
                bol = bol && form.rob[i].status;
            }
            while(bol == true)
            {
                do
                {
                    target = rand.Next(0,Convert.ToInt32(form.textBox2.Text));
                }
                while (form.rob[target].status == false);
                while ( true)
                {
                    if (Math.Abs(x - form.rob[target].x) < 3 && Math.Abs(y - form.rob[target].y) < 3)
                    {
                        form.rob[target].status = false;
                        break;
                    }
                    if (x < form.rob[target].x)
                    {
                        x++;
                    }
                    if (x > form.rob[target].x)
                    {
                        x--;
                    }
                    if (y < form.rob[target].y)
                    {
                        y++;
                    }
                    if (y > form.rob[target].y)
                    {
                        y--;
                    }
                }
                for (int i = 0; i < Convert.ToInt32(form.textBox2.Text); i++)
                {
                    bol = bol && form.rob[i].status;
                }
            }
        }
    }
}

robi class:

<pre lang="c#">using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.Drawing;
using System.Drawing.Text;
using System.Drawing.Imaging;


namespace WindowsFormsApplication1
{
    class robi
    {
        public int x;
        public int y;
        public int number;
        public bool status;

        public robi(int X, int Y, int num)
        {
            status = true;
            x = X;
            y = Y;
            number = num;
        }
        public void Run()
        {

        }
    }
}

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Threading;



namespace WindowsFormsApplication1
{
     
    public partial class Form1 : Form
    {
        public string[,] map;
        public police []pol;
        public robi[] rob;
        Bitmap map_bit;
        Graphics Map;
        Pen policepen;
        Pen robipen;
        Thread showmap;
        Thread[] policeman;
        public Form1()
        {
            InitializeComponent();
            
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            map = new string[pictureBox1.Size.Width, pictureBox1.Size.Height];
            map_bit = new Bitmap(pictureBox1.Size.Width, pictureBox1.Size.Height);
            Map = Graphics.FromImage(map_bit);
            policepen = new Pen(Color.Blue);
            robipen = new Pen(Color.Red);
            for (int i = 0; i < pictureBox1.Size.Width; i++)
            {
                for (int j = 0; j < pictureBox1.Size.Height; j++)
                {
                    map[i, j] = "  ";// :)
                }
            }
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            Point coordinate = new Point();
            Random rand = new Random();
            //init array of police
            pol = new police[Convert.ToInt32(textBox1.Text)];
            for (int i = 0; i < Convert.ToInt32(textBox1.Text); i++)
            {
                coordinate.X = rand.Next(0, 400);
                coordinate.Y = rand.Next(0, 400);
                pol[i] = new police(coordinate.X, coordinate.Y,i);
                map[coordinate.X, coordinate.Y] = "P" + Convert.ToString(pol[i].number);
                  
            }
            //init array of rob
            rob = new robi[Convert.ToInt32(textBox2.Text)];
            for (int i = 0; i < Convert.ToInt32(textBox2.Text); i++)
            {
                coordinate.X = rand.Next(0, 400);
                coordinate.Y = rand.Next(0, 400);
                rob[i] = new robi(coordinate.X, coordinate.Y, i);
                map[coordinate.X, coordinate.Y] = "R" + Convert.ToString(rob[i].number);
            }
            RUN();
        }

        public void convertMapToImg()
        {
            string temp = "";
            char ch;
            bool bol = true;
            int p;
            for (int i = 0; i < Convert.ToInt32(textBox2.Text); i++)
			{
                bol = bol && rob[i].status;
			}
            while(bol)
            {
                for (int i = 0; i < pictureBox1.Size.Width; i++)
                {
                   for (int j = 0; j < pictureBox1.Size.Height; j++)
                   {
                       temp = map[i, j]; 
                       ch = temp[0];
                       if (ch == 'P')
                       {
                           ch = temp[1];
                           p = ch - 48;
                           Map.DrawEllipse(policepen, pol[p].x, pol[p].y,10,10);
                       }
                       ch = temp[0];
                       if (ch == 'R')
                       {
                           ch = temp[1];
                           p = ch - 48;
                           Map.DrawEllipse(robipen, rob[p].x, rob[p].y, 10, 10);
                       }
                    }
                }
                pictureBox1.Image = map_bit;
                for (int i = 0; i < Convert.ToInt32(textBox2.Text); i++)
                {
                    bol = bol && rob[i].status;
                }
            }
        }

        public void RUN()
        {
            showmap = new Thread(this.convertMapToImg);
            showmap.Start();
            policeman = new Thread[Convert.ToInt32(textBox1.Text)];
            for (int i = 0; i <Convert.ToInt32(textBox1.Text) ; i++)
            {
                policeman[i] = new Thread(pol[i].Move);
                policeman[i].Start();
            }
        }
    }
}