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Warning: preg_match(): Compilation failed: quantifier does not follow a repeatab

sallijane — Thu, 27 May 2021 22:44:45 +0000

I get a whole series of these messages:

Warning: preg_match(): Compilation failed: quantifier does not follow a repeatable item at offset 1 in?/homepages/18/d221467449/htdocs/clickandbuilds/LackawannaCoalition/wp-includes/class-wp.php?on line?223

Warning: preg_match(): Compilation failed: quantifier does not follow a repeatable item at offset 1 in?/homepages/18/d221467449/htdocs/clickandbuilds/LackawannaCoalition/wp-includes/class-wp.php?on line?224
and a single instance of this message at the end.
Warning: Cannot modify header information - headers already sent by (output started at /homepages/18/d221467449/htdocs/clickandbuilds/LackawannaCoalition/wp-includes/class-wp.php:223) in?/homepages/18/d221467449/htdocs/clickandbuilds/LackawannaCoalition/wp-admin/admin-header.php?on line?9

I had just updated Gutenberg plug-in and, I believe, PublishPress Authors. I have the WP Safe Mode plug-in, which I activated, but the warnings stayed. I tried switching themes from my Ice Cold child theme to twenty-twentyone, but the warnings stayed.

I am relatively new to all of this; I know that this is a “warning”, but when I go to view a post, this is copied on that page (at least as a logged-in administrator); the site is under development, not yet live (a transition from Joomla in progress), so IDK how live posts would display.

I just checked the site health status screen; imagick has been shown as missing before, so that does not worry me; I see that the REST API did not process context correctly, IDK what that means, nor do I remember seeing that before. Also, I see that the “authorization header”, which apparently comes from 3rd-party applications (of which I don’t remember approving any), is missing.

WP version 5.7.2; PHP 7.4.18; SQL server up to date; 13 other tests passed.
Any help is welcome.

access to my word press site

Katrina Osborne — Wed, 12 Aug 2015 04:44:13 +0000

I can not confirm the version of word press as I am unable to access the site to confirm it.

I was making changes to the header when the changes were taking more than 20 minutes to activate once saved. I thought something was wrong so I exited the page by hitting the back arrow and this message pops up when I try to log on:Warning: Cannot modify header information – headers already sent by (output started at /home/prempa/public_html/wp-content/themes/infiword/library/cleanup.php:7) in /home/prempa/public_html/wp-includes/pluggable.php on line 1196.

I am unable to even get to the home page to log on.
Any help greatly appreciated.

Can't add "New Page"!

ronrevere — Tue, 22 Jul 2014 20:53:41 +0000

I have been using WP for 4 years…not a newbie! I need to add a page…no big deal, right?
Yet, I get these messages every time I try to “publish” a new page:

Warning: Cannot modify header information – headers already sent by (output started at /home/content/32/6831232/html/wp-content/plugins/vr-visitas/includes/vr-visitas-functions.php:1) in /home/content/32/6831232/html/wp-admin/post.php on line 235

What do I do?

Warning: Cannot modify header information

addambom — Tue, 01 Oct 2013 08:48:30 +0000

I am having a big problem trying to login to my clients wordpress. I cleaned up some hacking that was going on then a few days later this happens. Please advise how i can fix this problem.. Here is a link to the site…
https://sycamorenurses.com/wp-admin/

can't modify headers – comments-template.php & pluggable.php

stephenrusselcrane@yahoo.com — Mon, 06 Feb 2012 19:52:48 +0000

I recently tried logging in to my site backstage and got this message

Warning: Cannot modify header information – headers already sent by (output started at …/wp-includes/comment-template.php:1552) in …/wp-includes/pluggable.php on line 866

today it wont let me on the site itself & it is giving me the same message. What happened and how do i fix it?

Cannot modify header information – headers already sent by (output started at

rcpkrc — Wed, 28 Mar 2007 19:49:04 +0000

Hello friends, l am having this error, anyone know the reason ? thanks..

Warning: Cannot modify header information - headers already sent by (output started at /home/xxxxxx/public_html/blog/wp-content/plugins/widgets2/widgets.php:2290) in /home/xxxxxx/public_html/blog/wp-includes/pluggable.php on line 275