Title: [Plugin: Font] Warning: Cannot modify header information – headers already sent…
Last modified: August 19, 2016

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# [Plugin: Font] Warning: Cannot modify header information – headers already sent…

 *  [LJagermaster](https://wordpress.org/support/users/the-living-legend/)
 * (@the-living-legend)
 * [15 years, 2 months ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/)
 * As soon as I activated the Font plugin the following message appeared near the
   top of the plugins page:
 * > The plugin generated 3 characters of unexpected output during activation. If
   > you notice “headers already sent” messages, problems with syndication feeds
   > or other issues, try deactivating or removing this plugin.
 * And sure enough, when I reloaded the sites homepage the following message was
   displayed at the top of the page:
 * > Warning: Cannot modify header information – headers already sent by (output
   > started at /…/wp-content/plugins/font/Font.php:1) in /…/wp-content/plugins/
   > wp-activity/wp-activity.php on line 172
 * On this occasion it seems to be conflicting with the WP-Activity plugin, of which
   the above mentioned line (172) contains the following:
 * >  setcookie(‘act_logged’,time());
 * I’d prefer to keep both activated with the WP-Activity plugin taking priority
   so any help to resolve this would be greatly appreciated.
 * Thanks in advance,
 * LJ
 * P.S.
    I had a look inside the wp-activity.php file for the line **setcookie(‘
   act_logged’,time());**, but it’s not inside that file which rules out a duplicate
   execution issue…

Viewing 13 replies - 1 through 13 (of 13 total)

 *  Thread Starter [LJagermaster](https://wordpress.org/support/users/the-living-legend/)
 * (@the-living-legend)
 * [15 years, 2 months ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029214)
 * I stand corrected, it’s also causing the same issue with the Social Connect plugin
   when clicking on some of the Open ID Providers – this is a wild guess but I’m
   assuming it’ll conflict pretty much any plugin that checks if a user is logged
   in (could be – and probably am – wrong but it seems like a likely scenario based
   on the above trend).
 * Would removing the line I posted above – **setcookie(‘act_logged’,time());** –
   cause more problems than I’m already experiencing?
 *  Plugin Author [killerdeveloper](https://wordpress.org/support/users/killerdeveloper/)
 * (@killerdeveloper)
 * [15 years, 2 months ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029508)
 * Hello,
    Thanks for your feedback and using my plugin!
 * I’m currently working on major extension which will make this plugin 2x more 
   useful!
    During that I’ve made some mistake and in late night hours commited 
   that in SVN.
 * Somehow “Include Unicode Signature (BOM)” became seleted in main .php file properties
   and that was the reason of generating that unexpected input!
 * Remove and reinstall plugin that will help as correct version is already online.
   Please confirm that’s working for you too.
 * Expect version 2.0 with main page title and post titles changing option soon!
 * cheers,
    Pawel
 *  Thread Starter [LJagermaster](https://wordpress.org/support/users/the-living-legend/)
 * (@the-living-legend)
 * [15 years, 2 months ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029521)
 * Just to clarify, do you mean the working version is available via the plugin 
   directory (can be installed automatically from the admin area)? I just searched
   for it and the only matching result was the 1.0beta version I have installed,
   there’s also no mention of any changes:
 * [http://wordpress.org/extend/plugins/font/](http://wordpress.org/extend/plugins/font/)
 * Just need to be sure in case after re-installing it I have the same issue… :-/
 *  Plugin Author [killerdeveloper](https://wordpress.org/support/users/killerdeveloper/)
 * (@killerdeveloper)
 * [15 years, 2 months ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029522)
 * Yes you have to download same version I’ve put no update information just as 
   when I’ve broken it. First deactivate and remove with files. Then install again.
 * This is my first plugin so I have to learn how to put new version…as new version:)
   Currently I’m learning how to do it because I’m going to upload big new version
   tonight in couple of hours!
 * Great features as I said in previous post!
 *  Thread Starter [LJagermaster](https://wordpress.org/support/users/the-living-legend/)
 * (@the-living-legend)
 * [15 years, 2 months ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029535)
 * Thanks for the update. Unfortunately there’s another issue though, when I change
   regular font into one provided by your plugin it seems to work fine, however 
   as of yet I’ve been unable to change the font of a text entry more than once.
   I’ve tried closing and re-opening the Font box but doesn’t make any difference…:-/
 *  Plugin Author [killerdeveloper](https://wordpress.org/support/users/killerdeveloper/)
 * (@killerdeveloper)
 * [15 years, 1 month ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029549)
 * Where’s the problem occuring?
    Is it post editing and changing of selected text
   or Appearance->Font and changing font for blog title and post headers? What is
   your browser? Which wordpress and plugin version are you using?
 *  Thread Starter [LJagermaster](https://wordpress.org/support/users/the-living-legend/)
 * (@the-living-legend)
 * [15 years, 1 month ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029555)
 * It was the post/page edit screen I was referring to initially, however, I’ve 
   since tried the Page Title function and that didn’t work either. Using the latest
   version of the browser with 3.0.1 of wordpress (due to essential customisations
   made to core wordpress files before 3.0.2 was released it’s not possible to upgrade
   the core files for the foreseeable future as it would create too big a workload
   than can be handled). Using Orca which runs on FireFox’s Gecko engine (it’s basically
   a more functional “skin” for the engine)… :-/
 *  Plugin Author [killerdeveloper](https://wordpress.org/support/users/killerdeveloper/)
 * (@killerdeveloper)
 * [15 years, 1 month ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029558)
 * I’ve just tried on 3.0.1 version and it was working fine. Try other browser. 
   Plugin was developed for the latest versions of IE, Chrome and Firefox. Orca 
   might have same engine as FF but still MAY be a reason of this problem.
 *  Thread Starter [LJagermaster](https://wordpress.org/support/users/the-living-legend/)
 * (@the-living-legend)
 * [15 years, 1 month ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029561)
 * Sorry, I should have been more specific, it doesn’t use the same engine as firefox,
   it uses firefox’s own engine to display web content (if firefox isn’t installed
   on the same machine as Orca it can’t be used). Much like the SeaMonkey browser(
   which is completely unrelated, I’m just using it as an example as it’s a more
   notorious browser than Orca).
 * However, I did log in using firefox and attempted to change the page title font,
   it still didn’t work (when I click on the desired font nothing happens within
   the preview window, when I click save the preview window is the same as before
   and all pages on the site remain unchanged). And it’s the same story for the 
   post/page edit screen, can change a font item once, but can’t change it again…:-/
 * If it’s definitely working on your end under 3.0.1 then there’s a chance it’s
   a conflict with another plugin. Are you aware of it conflicting with any specific
   ones, or even certain types of plugins (that call certain functions)?
 *  Plugin Author [killerdeveloper](https://wordpress.org/support/users/killerdeveloper/)
 * (@killerdeveloper)
 * [15 years, 1 month ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029594)
 * Aaah I think the problem is SELECTOR under preview.
    Show me a website and I’ll
   see if selector is set up correctly.
 *  Thread Starter [LJagermaster](https://wordpress.org/support/users/the-living-legend/)
 * (@the-living-legend)
 * [15 years, 1 month ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029595)
 * > Show me a website and I’ll see if selector is set up correctly.
 * I’m not sure what you mean by that – do you mean my own website or a general 
   one? I’m confused as to how either would help (surely the “selector” code would
   be contained in the plugin code?)… :-/
 * If you mean the site I used it on, it’s at:
    [http://sin.theweare.net](http://sin.theweare.net)
 *  Plugin Author [killerdeveloper](https://wordpress.org/support/users/killerdeveloper/)
 * (@killerdeveloper)
 * [15 years, 1 month ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029596)
 * Finally we have an answer,
 * The problem is that your template is using image as a title and that’s why there’s
   nothing we can do to change font using “Font” plugin.
 * Here’s the source to that image from your blog:
    [http://sin.theweare.net/wp-content/themes//grunge-style/images/bg_header.jpg](http://sin.theweare.net/wp-content/themes//grunge-style/images/bg_header.jpg)
 *  Thread Starter [LJagermaster](https://wordpress.org/support/users/the-living-legend/)
 * (@the-living-legend)
 * [15 years, 1 month ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029597)
 * So what you’re saying is the plugin can only change the main title of the blog
   up in the **header** section? The way it’s worded it sounds like it’s supposed
   to be able to change the titles of pages & posts (the “Page title/Post headers”
   selectable items strongly imply this). I experience the same issue posted above
   with both of these functions (Page title/Post header). Since they’re displayed
   in text format (and if this plugin should be able to change the font used on 
   those items) the main image wouldn’t interfere with them.
 * The CSS file also uses the default page/post title styling classes so shouldn’t
   be any problems there… It also wouldn’t explain why I’m only able to change the
   font of a text entry once in the Edit Post/Page box… :-/

Viewing 13 replies - 1 through 13 (of 13 total)

The topic ‘[Plugin: Font] Warning: Cannot modify header information – headers already
sent…’ is closed to new replies.

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## Tags

 * [font](https://wordpress.org/support/topic-tag/font/)

 * 13 replies
 * 2 participants
 * Last reply from: [LJagermaster](https://wordpress.org/support/users/the-living-legend/)
 * Last activity: [15 years, 1 month ago](https://wordpress.org/support/topic/plugin-font-warning-cannot-modify-header-information-headers-already-sent/#post-2029597)
 * Status: not resolved