C# 2008 (3.5 Framework) An object reference is required for the non-static field, method, or property

I am receiving the above error.  I've indicated where the error is occurring.  

Public class Sender
{
        SendEmail _sendEmail = new SendEmail();
        .....

	public static void Send(ConfigEmail email)
	{
		email.body = ReplaceCode(email.body, ReplaceType.Html);
		email.body = css.Replace("{MESSAGE EMAIL}", email.body);
		email.body = email.body.ToString().Replace("\r\n", "<br/>");
		email.body = email.body.ToString().Replace("Do not reply to this automatic message", String.Empty);
		try
		{
			_sendEmail.Send(email);  //ERROR OCCURS HERE
		}
		catch (Exception ex)
		{
			throw new Exception(ex.Message);
		}
	}
}

public class SendEmail
{
	public static void Send(ConfigEmail email)
	{
		email.body = ReplaceCode(email.body, ReplaceType.Html);
		email.body = css.Replace("{MESSAGE EMAIL}", email.body);
		email.body = email.body.ToString().Replace("\r\n", "<br/>");
		email.body = email.body.ToString().Replace("Do not reply to this automatic message", String.Empty);
		try
		{
			_sendEmail.Send(email);
		}
		catch (Exception ex)
		{
			throw new Exception(ex.Message);
		}
	}
	
	public class SendEmail
	{
		public static void Send(ConfigEmail emailStruct)
		{
			//........
			SendIt(emailStruct);
		}
		
        private static void SendIt(ConfigEmail emailStruct)
        {
			//.........
			//SMTP Sending email
		}
	}	
}

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