problem after enabling custom profile field validation

after i enable my custom profile field validation module which is

the .info file is

; $Id$
name = Custom Helper Functions
description = A module to add custom form handling for my site.
package = Helpers
core = 6.x

and the .module file is

// $Id$
function sitehelper_form_alter(&$form, $form_state, $form_id) {
//intercept user_register and user_edit forms and add validation function for edad
  if ($form_id == 'user_register' || $form_id == 'user_edit') {
   
   $form['Educational Information']['profile_class']['#element_validate'] = array('sitehelper_profile_edad_validate');
   
  
   
    $form['Educational Information']['profile_branch']['#element_validate'] = array('sitehelper2_profile_edad_validate');
    
     $form['Terms And Conditions']['profile_terms']['#element_validate'] = array('sitehelper3_profile_edad_validate');
   
    $form['Educational Information']['profile_location']['#element_validate'] = array('sitehelper4_profile_edad_validate');
  }
}


function sitehelper_profile_edad_validate ($element) {
   if ($element['#value'] == "<---->") {
     form_set_error('profile_edad', t('Please select the appropriate class'));
   }
}

function sitehelper2_profile_edad_validate ($element) {
   if ($element['#value'] == "<---Choose--->" || $element['#value'] == "<----Medicine--->" || $element['#value'] == "<---Engineering--->" || $element['#value'] == "<---Business--->") {
     form_set_error('profile_edad', t('Please select the appropriate department'));
   }
}

function sitehelper3_profile_edad_validate ($element) {
   if ($element['#value'] == "0") {
     form_set_error('profile_edad', t('You need to accept the terms and conditions including the privacy policy before using the services of this site.'));
   }
}

function sitehelper4_profile_edad_validate ($element) {
   if ($element['#value'] == "<---Choose--->") {
     form_set_error('profile_edad', t('Please select the location of your present institution.'));
   }
}

it gives me this warning,
------------------------------------------------------------

wwarning: Cannot modify header information - headers already sent by (output started at /home/content/a/s/s/mysite/html/modules/Form validation/sitehelper.module:2) in /home/content/a/s/s/mysite/html/includes/session.inc on line 97.

warning: session_regenerate_id() [function.session-regenerate-id]: Cannot regenerate session id - headers already sent in /home/content/a/s/s/mysite/html/includes/session.inc on line 100.

mysite= the name of my site.

----------------------------------------------------------
this happened when i tested my site in godaddy, this warning message comes after i login. And to go to my homepage i need to refresh.

for example, if i login into my site using user name and password it doesnt open, it shows a blank white page, and after i refresh it goes to my home page- then on the main screen i get the above warning.

it was working fine on my localhost. what could be the problem?