Warning: Cannot modify header information – headers already sent by
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Hi!
This error message appeared on my website. Do you have any idea, how to fix this?
Thank you
Warning: Invalid argument supplied for foreach() in /home/customer/www/elitebeautycosmetics.co.uk/public_html/wp-content/plugins/atum-stock-manager-for-woocommerce/classes/Addons/Addons.php on line 542
Warning: Cannot modify header information – headers already sent by (output started at /home/customer/www/elitebeautycosmetics.co.uk/public_html/wp-content/plugins/atum-stock-manager-for-woocommerce/classes/Addons/Addons.php:542) in /home/customer/www/elitebeautycosmetics.co.uk/public_html/wp-admin/includes/misc.php on line 1381
Warning: Cannot modify header information – headers already sent by (output started at /home/customer/www/elitebeautycosmetics.co.uk/public_html/wp-content/plugins/atum-stock-manager-for-woocommerce/classes/Addons/Addons.php:542) in /home/customer/www/elitebeautycosmetics.co.uk/public_html/wp-admin/post.php on line 231
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