Object reference not set to an instance of an object.

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C#3.5

Hi!I am getting the following error:
<<object>>
This picture bellow is the GridView for the first form that I have:

The first page is containing the grid view that has an hyper-link 'Buy'
The hyper-link will redirect you to another page which should display the specific information coming from the previous page
This the first page that have the GridView:

protected void GridView1_SelectedIndexChanging(object sender, GridViewSelectEventArgs e)
    {
        
        int newIndex = e.NewSelectedIndex;//Row that the user is selecting(!e is a parameter)
        object EventID = GridView1.DataKeys[newIndex].Value;


        string Game = GridView1.Rows[newIndex].Cells[0].Text;
        string Location=GridView1.Rows[newIndex].Cells[1].Text;
        string Address = GridView1.Rows[newIndex].Cells[2].Text;
        string Date = GridView1.Rows[newIndex].Cells[3].Text;
        string Hour = GridView1.Rows[newIndex].Cells[4].Text;
        
        MessageLabel.Text = string.Format("You have select<br />Match:{0}<br /> [Event ID:{1}],", Game,EventID);
        Session["Game"] = MessageLabel.Text;
       
    }

This second page is loading the session for the first page,and it were the page in point the error('GameLabel.Text = Session["Game"].ToString();'):

protected void Page_Load(object sender, EventArgs e)
    {
        GameLabel.Text = Session["Game"].ToString();
    } 

Help resolve this problem!