HTTP ERROR 500 on checkout page

[thymine]

Hi all, i have been getting HTTP ERROR 500 on my checkout page only. Can anyone point me in the right direction on how to solve this?

This is the error log i got from the log.


[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 zenCssButton() called at [/home4/diyhotspot/public_html/includes/functions/html_output.php:271]
#2 zen_image_submit() called at [/home4/diyhotspot/public_html/includes/templates/template_default/sideboxes/tpl_search_header.php:17]
#3 require(/home4/diyhotspot/public_html/includes/templates/template_default/sideboxes/tpl_search_header.php) called at [/home4/diyhotspot/public_html/includes/modules/sideboxes/search_header.php:21]
#4 require(/home4/diyhotspot/public_html/includes/modules/sideboxes/search_header.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_header.php:91]
#5 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_header.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:119]
#6 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: Use of undefined constant CSS_BUTTON_POPUPS_IS_ARRAY - assumed 'CSS_BUTTON_POPUPS_IS_ARRAY' (this will throw an Error in a future version of PHP) in /home4/diyhotspot/public_html/includes/functions/html_output.php on line 322
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 zenCssButton() called at [/home4/diyhotspot/public_html/includes/functions/html_output.php:271]
#2 zen_image_submit() called at [/home4/diyhotspot/public_html/includes/templates/template_default/sideboxes/tpl_search_header.php:17]
#3 require(/home4/diyhotspot/public_html/includes/templates/template_default/sideboxes/tpl_search_header.php) called at [/home4/diyhotspot/public_html/includes/modules/sideboxes/search_header.php:21]
#4 require(/home4/diyhotspot/public_html/includes/modules/sideboxes/search_header.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_header.php:213]
#5 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_header.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:119]
#6 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: Use of undefined constant CSS_BUTTON_POPUPS_IS_ARRAY - assumed 'CSS_BUTTON_POPUPS_IS_ARRAY' (this will throw an Error in a future version of PHP) in /home4/diyhotspot/public_html/includes/functions/html_output.php on line 322
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 zen_get_attributes_price_factor() called at [/home4/diyhotspot/public_html/includes/functions/functions_prices.php:1092]
#2 zen_get_attributes_price_final() called at [/home4/diyhotspot/public_html/includes/modules/responsive_classic/attributes.php:140]
#3 require(/home4/diyhotspot/public_html/includes/modules/responsive_classic/attributes.php) called at [/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php:76]
#4 require(/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:174]
#5 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: Use of undefined constant ATTRIBUTES_PRICE_FACTOR_FROM_SPECIAL - assumed 'ATTRIBUTES_PRICE_FACTOR_FROM_SPECIAL' (this will throw an Error in a future version of PHP) in /home4/diyhotspot/public_html/includes/functions/functions_prices.php on line 1016
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 zen_get_attributes_price_factor() called at [/home4/diyhotspot/public_html/includes/functions/functions_prices.php:1092]
#2 zen_get_attributes_price_final() called at [/home4/diyhotspot/public_html/includes/classes/observers/class.products_with_attributes_stock.php:295]
#3 products_with_attributes_stock->updateNotifyAttributesModuleOriginalPrice() called at [/home4/diyhotspot/public_html/includes/classes/class.base.php:103]
#4 base->notify() called at [/home4/diyhotspot/public_html/includes/modules/responsive_classic/attributes.php:193]
#5 require(/home4/diyhotspot/public_html/includes/modules/responsive_classic/attributes.php) called at [/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php:76]
#6 require(/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:174]
#7 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: Use of undefined constant ATTRIBUTES_PRICE_FACTOR_FROM_SPECIAL - assumed 'ATTRIBUTES_PRICE_FACTOR_FROM_SPECIAL' (this will throw an Error in a future version of PHP) in /home4/diyhotspot/public_html/includes/functions/functions_prices.php on line 1016
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 zen_get_attributes_price_factor() called at [/home4/diyhotspot/public_html/includes/functions/functions_prices.php:1092]
#2 zen_get_attributes_price_final() called at [/home4/diyhotspot/public_html/includes/modules/responsive_classic/attributes.php:140]
#3 require(/home4/diyhotspot/public_html/includes/modules/responsive_classic/attributes.php) called at [/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php:76]
#4 require(/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:174]
#5 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: Use of undefined constant ATTRIBUTES_PRICE_FACTOR_FROM_SPECIAL - assumed 'ATTRIBUTES_PRICE_FACTOR_FROM_SPECIAL' (this will throw an Error in a future version of PHP) in /home4/diyhotspot/public_html/includes/functions/functions_prices.php on line 1016
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 zen_get_attributes_price_factor() called at [/home4/diyhotspot/public_html/includes/functions/functions_prices.php:1092]
#2 zen_get_attributes_price_final() called at [/home4/diyhotspot/public_html/includes/classes/observers/class.products_with_attributes_stock.php:295]
#3 products_with_attributes_stock->updateNotifyAttributesModuleOriginalPrice() called at [/home4/diyhotspot/public_html/includes/classes/class.base.php:103]
#4 base->notify() called at [/home4/diyhotspot/public_html/includes/modules/responsive_classic/attributes.php:193]
#5 require(/home4/diyhotspot/public_html/includes/modules/responsive_classic/attributes.php) called at [/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php:76]
#6 require(/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:174]
#7 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: Use of undefined constant ATTRIBUTES_PRICE_FACTOR_FROM_SPECIAL - assumed 'ATTRIBUTES_PRICE_FACTOR_FROM_SPECIAL' (this will throw an Error in a future version of PHP) in /home4/diyhotspot/public_html/includes/functions/functions_prices.php on line 1016
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 zenCssButton() called at [/home4/diyhotspot/public_html/includes/functions/html_output.php:297]
#2 zen_image_button() called at [/home4/diyhotspot/public_html/includes/modules/product_prev_next.php:119]
#3 require(/home4/diyhotspot/public_html/includes/modules/product_prev_next.php) called at [/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php:92]
#4 require(/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:174]
#5 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: Use of undefined constant CSS_BUTTON_POPUPS_IS_ARRAY - assumed 'CSS_BUTTON_POPUPS_IS_ARRAY' (this will throw an Error in a future version of PHP) in /home4/diyhotspot/public_html/includes/functions/html_output.php on line 322
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 zenCssButton() called at [/home4/diyhotspot/public_html/includes/functions/html_output.php:297]
#2 zen_image_button() called at [/home4/diyhotspot/public_html/includes/modules/product_prev_next.php:120]
#3 require(/home4/diyhotspot/public_html/includes/modules/product_prev_next.php) called at [/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php:92]
#4 require(/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:174]
#5 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: Use of undefined constant CSS_BUTTON_POPUPS_IS_ARRAY - assumed 'CSS_BUTTON_POPUPS_IS_ARRAY' (this will throw an Error in a future version of PHP) in /home4/diyhotspot/public_html/includes/functions/html_output.php on line 322
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 zenCssButton() called at [/home4/diyhotspot/public_html/includes/functions/html_output.php:297]
#2 zen_image_button() called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_reviews_default.php:47]
#3 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_reviews_default.php) called at [/home4/diyhotspot/public_html/includes/modules/tabbed_products_pro.php:416]
#4 require(/home4/diyhotspot/public_html/includes/modules/tabbed_products_pro.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_info_display.php:20]
#5 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_info_display.php) called at [/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php:178]
#6 require(/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:174]
#7 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: Use of undefined constant CSS_BUTTON_POPUPS_IS_ARRAY - assumed 'CSS_BUTTON_POPUPS_IS_ARRAY' (this will throw an Error in a future version of PHP) in /home4/diyhotspot/public_html/includes/functions/html_output.php on line 322
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 zenCssButton() called at [/home4/diyhotspot/public_html/includes/functions/html_output.php:297]
#2 zen_image_button() called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_reviews_default.php:104]
#3 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_reviews_default.php) called at [/home4/diyhotspot/public_html/includes/modules/tabbed_products_pro.php:416]
#4 require(/home4/diyhotspot/public_html/includes/modules/tabbed_products_pro.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_info_display.php:20]
#5 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_info_display.php) called at [/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php:178]
#6 require(/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:174]
#7 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: Use of undefined constant CSS_BUTTON_POPUPS_IS_ARRAY - assumed 'CSS_BUTTON_POPUPS_IS_ARRAY' (this will throw an Error in a future version of PHP) in /home4/diyhotspot/public_html/includes/functions/html_output.php on line 322
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 products_with_attributes_class_stock->zen_sba_dd_allowed() called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_modules_attributes.php:23]
#2 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_modules_attributes.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_info_display.php:123]
#3 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_info_display.php) called at [/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php:178]
#4 require(/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:174]
#5 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: Use of undefined constant PRODUCTS_OPTIONS_TYPE_GRID - assumed 'PRODUCTS_OPTIONS_TYPE_GRID' (this will throw an Error in a future version of PHP) in /home4/diyhotspot/public_html/includes/classes/class.products_with_attributes_class_stock.php on line 1578
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 products_with_attributes_class_stock->zen_sba_dd_allowed() called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_modules_attributes.php:23]
#2 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_modules_attributes.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_info_display.php:123]
#3 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_info_display.php) called at [/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php:178]
#4 require(/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:174]
#5 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: Use of undefined constant PRODUCTS_OPTIONS_TYPE_ATTRIBUTE_GRID - assumed 'PRODUCTS_OPTIONS_TYPE_ATTRIBUTE_GRID' (this will throw an Error in a future version of PHP) in /home4/diyhotspot/public_html/includes/classes/class.products_with_attributes_class_stock.php on line 1578
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 zenCssButton() called at [/home4/diyhotspot/public_html/includes/functions/html_output.php:271]
#2 zen_image_submit() called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_info_display.php:155]
#3 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_product_info_display.php) called at [/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php:178]
#4 require(/home4/diyhotspot/public_html/includes/modules/pages/product_info/main_template_vars.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:174]
#5 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: Use of undefined constant CSS_BUTTON_POPUPS_IS_ARRAY - assumed 'CSS_BUTTON_POPUPS_IS_ARRAY' (this will throw an Error in a future version of PHP) in /home4/diyhotspot/public_html/includes/functions/html_output.php on line 322
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 sizeof() called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_ezpages_bar_footer.php:19]
#2 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_ezpages_bar_footer.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_footer.php:32]
#3 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_footer.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:221]
#4 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[03-Mar-2020 14:19:53 Asia/Singapore] PHP Warning: sizeof(): Parameter must be an array or an object that implements Countable in /home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_ezpages_bar_footer.php on line 19
[03-Mar-2020 14:19:53 Asia/Singapore] Request URI: /index.php?main_page=product_info&products_id=564, IP address: 66.249.69.202
#1 zen_categories_ul_generator->buildBranch() called at [/home4/diyhotspot/public_html/includes/classes/categories_ul_generator.php:85]
#2 zen_categories_ul_generator->buildTree() called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_modules_mobile_menu.php:38]
#3 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/templates/tpl_modules_mobile_menu.php) called at [/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php:261]
#4 require(/home4/diyhotspot/public_html/includes/templates/responsive_classic/common/tpl_main_page.php) called at [/home4/diyhotspot/public_html/index.php:97]

[mc12345678]

The message above is from looking at a product page and is not related to the checkout page issue reported. It does appear that at least not the latest version/files for Stock By Attributes is being used as the current fileset handles even strict php operation to not issue the warnings seen in the above.

When you navigate to the checkout process and get the 500 error, yes there should be a log generated, though it may take a moment even when trying to refresh the list of files. Try though to be sure to reference a file associated with issues in the checkout rather than just viewing the product.

By the way, what php version is being used with that reported Zen Cart 1.5.5 system? And what sub-version of 1.5.5 is it?

[swguy]

Just looking at these errors, my first guess is that your hoster has updated your PHP version, and set it too high for your (older) ZenCart version. You should downgrade PHP (start with 5.6, then go to 7) and plan to upgrade Zen Cart.