Response is not available in this context. Response.Write(ex.ToString());

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C#

ASP.NET

I wrote this code in the global.asax following the classical code. Each time I start the website it shows this error. After i refresh the page, it goes the correct page.I don't understand why.

<script runat="server">
    void Application_Start(object sender, EventArgs e) 
    {
        try
        {
            if (Roles.RoleExists("Administrators") == false)
                Roles.CreateRole("Administrators");
            if (Membership.FindUsersByName("ken").Count == 0)
            {
                Membership.CreateUser("ken", "123", "ken@jobpost.com");
                Roles.AddUserToRole("ken", "Administrators");
            }
            if (Membership.FindUsersByName("dan").Count == 0)
                Membership.CreateUser("dan", "123", "dan@jobpost.com");
            
                     
        }
        catch (Exception ex)
        {
            Response.Write(ex.ToString());
        }
   }
    
  
       
</script>

Response is not available in this context. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Response is not available in this context.
Source Error: 
Line 26:         catch (Exception ex) 
Line 27:         { 
Line 28:             Response.Write(ex.ToString()); 
Line 29:         }