response.sendRedirect is not working.

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servlet

Can some one please help why am i getting below error? "org.apache.catalina.connector.ResponseFacade.sendRedirect(ResponseFacade.java:438)"
Whats wrong in my code??
Contol is not getting moved from servlet to jsp. Please correct my code.

Servlet Class

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		User user = new User();
		HttpSession session = request.getSession(true);
		user.setFirstName(request.getParameter("FirstName"));
		user.setPassword(request.getParameter("Password"));
		user.setConfirmPassword(request.getParameter("ConfirmPassword"));
		user.setEmail(request.getParameter("Email"));
		boolean passwordVerify = PasswordVerification.verifyPassword(user);
		boolean emailVerify= EmailIdValidation.isValidEmailId(user);

		if( user.getFirstName().startsWith("S"))
		{
                     if(passwordVerify )
                        {
                         if(!emailVerify)
                          {
                            response.sendRedirect("EmailValidation.jsp");
                           }
                      user.setLastName(request.getParameter("LastName"));
		   user.setContactNumber(request.getParameter("ContactNumber"));
		   user.setLandLine(request.getParameter("LandLine"));
		    response.sendRedirect("Success.jsp");		
                       }
                     else
                     {
                       response.sendRedirect("Error.jsp");
                      } 		
		}
               }


	
public class PasswordVerification {

	public static boolean verifyPassword(User user)
	{
		//String userName = user.getFirstName();
		String password = user.getPassword();
		String confirmPW = user.getConfirmPassword();
		System.out.println(password);
		System.out.println(confirmPW);
		if(password.equals(confirmPW)|| password.length()>8)
		{
			user.setValid(true);
		}
		else{ 
			System.out.println("Invalid Password");
			}
		return true;		
	}
}	


public class EmailIdValidation {

	public static boolean isValidEmailId(User user)
	{
	String email = user.getEmail();
	String emailPattern="^([A-Za-z0-9_\\-\\.])+\\@([A-Za-z0-9_\\-\\.])+\\.([A-Za-z]{2,4})";
		if(email==null ) 
		{   return false; 
		}
			if(!email.matches(emailPattern))
		{
			return false;
		}
		return true;
	}
}