This topic has 15 replies, 3 voices, and was last updated 7 years by 
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The following error messages are appearing in the WordPress admin:
Notice: get_plugin_data was called with an argument that is deprecated since version 3.0.0! The Site Wide Only: true plugin header is deprecated. Use Network: true instead. in /home/lfa/public_html/wp-includes/functions.php on line 4045
Warning: Cannot modify header information – headers already sent by (output started at /home/lfa/public_html/wp-includes/functions.php:4045) in /home/lfa/public_html/wp-admin/includes/misc.php on line 1124
Warning: Cannot modify header information – headers already sent by (output started at /home/lfa/public_html/wp-includes/functions.php:4045) in /home/lfa/public_html/wp-includes/option.php on line 919
Warning: Cannot modify header information – headers already sent by (output started at /home/lfa/public_html/wp-includes/functions.php:4045) in /home/lfa/public_html/wp-includes/option.php on line 920
Today, after I saw these error messages, I changed PHP versions from 5.6 to 7.1 to try to resolve this problem, but this did not resolve the problem.
I’ve attached to this ticket a .txt file which includes the contents of the debug.log of the website.
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