When uploading a new post, I also got the following message:
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Warning: Cannot modify header information – headers already sent by (output started at /home/…/public_html/wp-content/plugins/mashsharer/class.mashsharer.php:147) in /home/…/public_html/wp-admin/post.php on line 233
Warning: Cannot modify header information – headers already sent by (output started at /home/…/public_html/wp-content/plugins/mashsharer/class.mashsharer.php:147) in /home/…/public_html/wp-includes/pluggable.php on line 896