Can not export products - Resolved

-- url of the page with the problem -- : pumpkinvines.com/e/administrator/index.p...ikashop&ctrl=product
-- HikaShop version -- : 4.21
-- Joomla version -- : 3.9.11
-- PHP version -- : 7.1.22
-- Browser(s) name and version -- : Chrome
-- Error-message(debug-mod must be tuned on) -- : Cannot modify header information - headers already sent by

I have been having a lot of problems today. Hopefully there is an easy fix.
I am getting this error when attempting an export of products: "Cannot modify header information - headers already sent by...

Is there a security setting that I messed when I was troubleshooting earlier?

Any ideas would be appreciated.

Full text below:
Notice: Undefined offset: 1489 in /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/views/product/tmpl/export.php on line 95

Notice: Trying to get property of non-object in /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/views/product/tmpl/export.php on line 95

Warning: Cannot modify header information - headers already sent by (output started at /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/views/product/tmpl/export.php:95) in /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/helpers/spreadsheet.php on line 68

Warning: Cannot modify header information - headers already sent by (output started at /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/views/product/tmpl/export.php:95) in /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/helpers/spreadsheet.php on line 69

Warning: Cannot modify header information - headers already sent by (output started at /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/views/product/tmpl/export.php:95) in /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/helpers/spreadsheet.php on line 70

Warning: Cannot modify header information - headers already sent by (output started at /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/views/product/tmpl/export.php:95) in /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/helpers/spreadsheet.php on line 71

Warning: Cannot modify header information - headers already sent by (output started at /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/views/product/tmpl/export.php:95) in /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/helpers/spreadsheet.php on line 72

Warning: Cannot modify header information - headers already sent by (output started at /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/views/product/tmpl/export.php:95) in /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/helpers/spreadsheet.php on line 73

Warning: Cannot modify header information - headers already sent by (output started at /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/views/product/tmpl/export.php:95) in /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/helpers/spreadsheet.php on line 74

Warning: Cannot modify header information - headers already sent by (output started at /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/views/product/tmpl/export.php:95) in /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/helpers/spreadsheet.php on line 75

Warning: Cannot modify header information - headers already sent by (output started at /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/views/product/tmpl/export.php:95) in /usr/www/users/kdesilva/pumpkin/e/administrator/components/com_hikashop/helpers/spreadsheet.php on line 77

I turned on Joomla debugging in the Global Configuration; tried again and the product export function worked.
I turned off debugging and product export function is working again.