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upgrade v2.2 to v2.3.4.1 after getting admin error


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I have upgraded OSCommerce v2.2 to v2.3.4.1 after the front store completely works. But admin getting errors like below:

Warning: Use of undefined constant ENABLE_SSL - assumed 'ENABLE_SSL' (this will throw an Error in a future version of PHP) in /home/inceptio/public_html/curtispayments/test-os/admin/includes/functions/html_output.php on line 14

Warning: Cannot modify header information - headers already sent by (output started at /home/inceptio/public_html/curtispayments/test-os/admin/includes/functions/html_output.php:14) in /home/inceptio/public_html/curtispayments/test-os/admin/includes/functions/general.php on line 25

I have already SSL enabled on my website. also, add below code in both configure.php files

define('ENABLE_SSL', true);

But didn't working as well

Admin: https://inceptionsystem.com/curtispayments/test-os/admin/
Front: https://inceptionsystem.com/curtispayments/test-os/

How can I solve this? Does anyone suggest for very appreciate?

Thank you


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3 hours ago, mujahid said:

Warning: Cannot modify header information - headers already

This may indicate the problem. It usually occurs due to an extra space at the beginning or end of a file. My guess is that your editor caused that when you made a change. I would check the configure file but also the html_output.php file or any file you have edited.

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