Hello

I have a real problem, few days before launching, I suddenly get a white page when I want to send a contact us form

I tried:
https://www.zen-cart.com/tutorials/index.php?article=82

the errors I see are:

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/jeshop/public_html/includes/local/configure.php:1) in /home/jeshop/public_html/includes/functions/sessions.php on line 108

Notice: Constant OFFICE_IP_TO_HOST_ADDRESS already defined in /home/jeshop/public_html/includes/languages/french/email_extras.php on line 56

Notice: Constant OTHER_IMAGE_ already defined in /home/jeshop/public_html/includes/languages/french/other_images_names.php on line 35

Notice: Constant OTHER_IMAGE_ already defined in /home/jeshop/public_html/includes/languages/french/other_images_names.php on line 36

Notice: Constant OTHER_IMAGE_ already defined in /home/jeshop/public_html/includes/languages/french/other_images_names.php on line 37

Notice: Constant OTHER_IMAGE_ already defined in /home/jeshop/public_html/includes/languages/french/other_images_names.php on line 38

Notice: Constant BUTTON_IMAGE_GOTO_PROD_DETAILS already defined in /home/jeshop/public_html/includes/languages/french/other_images_names.php on line 44

Notice: Constant BUTTON_GOTO_PROD_DETAILS_ALT already defined in /home/jeshop/public_html/includes/languages/french/other_images_names.php on line 68

Warning: Cannot modify header information - headers already sent by (output started at /home/jeshop/public_html/includes/local/configure.php:1) in /home/jeshop/public_html/includes/init_includes/init_templates.php on line 78

Notice: Constant HEADING_TITLE already defined in /home/jeshop/public_html/includes/languages/french/contact_us.php on line 15

Notice: Undefined index: customer_id in /home/jeshop/public_html/includes/modules/pages/contact_us/header_php.php on line 23

Notice: Undefined index: EMAIL_TO_NAME in /home/jeshop/public_html/includes/functions/functions_email.php on line 83

Notice: Undefined index: EMAIL_TO_ADDRESS in /home/jeshop/public_html/includes/functions/functions_email.php on line 84

Notice: Undefined index: EMAIL_SUBJECT in /home/jeshop/public_html/includes/functions/functions_email.php on line 85

Notice: Undefined index: EMAIL_FROM_NAME in /home/jeshop/public_html/includes/functions/functions_email.php on line 86

Notice: Undefined index: EMAIL_FROM_ADDRESS in /home/jeshop/public_html/includes/functions/functions_email.php on line 87

Notice: Undefined variable: email_reply_to_address in /home/jeshop/public_html/includes/functions/functions_email.php on line 219

Notice: Undefined variable: email_reply_to_name in /home/jeshop/public_html/includes/functions/functions_email.php on line 220

Warning: Cannot modify header information - headers already sent by (output started at /home/jeshop/public_html/includes/local/configure.php:1) in /home/jeshop/public_html/includes/functions/functions_general.php on line 44


my page:
jeshop.ma/index.php?main_page=contact_us

any clue?