Cannot modify header information

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Hi!

I have similar issue on my site:

Cannot start session when headers already sent in /home/klient.dhosting.pl/msalamon/totesea.pl/public_html/wp-content/plugins/woocommerce-dotpay/woocommerce-dotpay.php on line 161

Warning: session_start(): Cannot start session when headers already sent in /home/klient.dhosting.pl/msalamon/totesea.pl/public_html/wp-content/plugins/woocommerce-dotpay/woocommerce-dotpay.php on line 179

Warning: Cannot modify header information – headers already sent by (output started at /home/klient.dhosting.pl/msalamon/totesea.pl/public_html/wp-content/plugins/sticky-add-to-cart-for-woocommerce/inc/options-framework.php:1) in /home/klient.dhosting.pl/msalamon/totesea.pl/public_html/wp-includes/functions.php on line 6029

Warning: session_start(): Cannot start session when headers already sent in /home/klient.dhosting.pl/msalamon/totesea.pl/public_html/wp-content/plugins/flexible-shipping/classes/class-flexible-shipping-plugin.php on line 350

Warning: Cannot modify header information – headers already sent by (output started at /home/klient.dhosting.pl/msalamon/totesea.pl/public_html/wp-content/plugins/sticky-add-to-cart-for-woocommerce/inc/options-framework.php:1) in /home/klient.dhosting.pl/msalamon/totesea.pl/public_html/wp-admin/includes/misc.php on line 1252

Warning: Cannot modify header information – headers already sent by (output started at /home/klient.dhosting.pl/msalamon/totesea.pl/public_html/wp-content/plugins/sticky-add-to-cart-for-woocommerce/inc/options-framework.php:1) in /home/klient.dhosting.pl/msalamon/totesea.pl/public_html/wp-admin/admin-header.php on line 9

Hello Web88,
You can rename the “sg-cachepress” from file manager. And check for the resolution and confirm again.

Thank you

There should be no spaces before the <?php tag in inc/ options-framework.php.
After removing the space, there is no error and also no issue on the health check.

I found, after many evenings…
Warning: Cannot modify header information – headers already sent by (output started at /home/klient.dhosting.pl/(…)XX.php:13) in /home/klient.dhosting.pl/(…)XX.php on line 14

in 13th line i had “echo”, in 14th line “setcookie”. It doesn’t working.

You have to write all COOKIE code before else PHP code.
or
turn on the “output buffering”. Write ob_start(); on the start, after open “<?php”, but i don’t now is that a good idea.