I have been trying to install "Head META Description" plugin but I have some error when I activated it
Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/math-comment-spam-protection.php:1) in wp-includes/pluggable-functions.php on line 269
and I noticed some error message and changed view in writing post tab
Warning: Cannot modify header information - headers already sent by (output started at wp-content/plugins/math-comment-spam-protection.php:1) in wp-admin/inline-uploading.php on line 5
Warning: Cannot modify header information - headers already sent by (output started at wp-content/plugins/math-comment-spam-protection.php:1) in /wp-includes/pluggable-functions.php on line 269
Can somebody help me ? please
I don't understand what that errors mean and how to fix it.