Getting headers already sent error from plugin

If you look at the source of the page you will see this around line 122:

<div class="nav-collapse collapse">
                    <br />
<b>Warning</b>:  session_start() [<a href="https://wordpress.stackexchange.com/questions/105453/function.session-start">function.session-start</a>]: Cannot send session cookie - headers already sent by (output started at /home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-includes/functions.php:2841) in <b>/home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-content/plugins/osu-royaltfreemusic/osu-royaltyfreemusic.php</b> on line <b>225</b><br />
<br />
<b>Warning</b>:  session_start() [<a href="https://wordpress.stackexchange.com/questions/105453/function.session-start">function.session-start</a>]: Cannot send session cache limiter - headers already sent (output started at /home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-includes/functions.php:2841) in <b>/home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-content/plugins/osu-royaltfreemusic/osu-royaltyfreemusic.php</b> on line <b>225</b><br />
<ul id="menu-primary" class="nav"><li id="menu-item-9" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-9"><a href="http://www.instrumentalbackgroundmusic.com/">Home</a></li>

Something is trying to start a session well into the body of the page. You can’t do that. Sessions need to be started before any content is sent to the browser.

The fix for this is conceptually simple– hook the session_start function to some hook that runs before content is printed. Something like this:

function boot_session() {
  session_start();
}
add_action('wp_loaded','boot_session');

I don’t know what, exactly, is calling session_start or why, so the practical fix may be more complicated but that is the basic fix.

Related Posts:

  1. Error messages when adding code to function.php or trying to delete inactive plugin files
  2. Call to undefined function get_header() in index.php
  3. “Cannot modify header information” means I can’t use wp_redirect
  4. White Screen on Site but wp-admin OK
  5. Fatal Error: get_header();
  6. Multiple use wp_logout_url() on page cause ‘header already sent’ error after submit form
  7. Why I am having error Call to undefined function get_header()?
  8. Error Message – Cannot login to WordPress
  9. Cannot access non-wordpress subdirectories as wordpress overrides them with a 404 error
  10. Change login error messages
  11. Notice: Undefined index: host in /var/www/html/wp-includes/canonical.php on line 445
  12. Notice: Constant WP_POST_REVISIONS already defined
  13. How to stop certain warning logging in error.log?
  14. Error 404 Page Not Found When Updating a Post or Page
  15. Debug mode shows Strict Standards
  16. Why on Earth am I getting “undefined_index” errors?
  17. Debugging ‘Object of class WP_Query could not be converted to int’ error
  18. Displaying oEmbed errors?
  19. Add image only in first post
  20. Warning: Cannot modify header information – headers already sent
  21. Object of class WP_Error could not be converted to string
  22. New WordPress Error Message – Not seen this before
  23. Getting Warnings & Notices from Fresh WordPress 3.1.2 install
  24. Fatal error: Call to undefined function get_header()
  25. Sodium compat error
  26. Fatal error: require(): Failed opening required ‘WP_DIRwp-blog-header.php’
  27. What do these “Failed to import” errors mean and how do I fix it?
  28. How to use add_settings_error in register_setting callback
  29. Application passwords not working on localhost?
  30. : Failed to load resource
  31. Error trying to publish immediately. Post status = future (Missed schedule error)
  32. Form Post results in 404 Not Found [duplicate]
  33. File does not exist – wp-index.php
  34. REST : how do you handle the rest_no_route error?
  35. “Undefined index” in wp-includes/media.php
  36. Sorry, you are not allowed to access this page dashboard
  37. Error on moving WordPress site to Host from Local installation
  38. Visual editor become blank after updating an article
  39. Fatal error: Allowed memory size of 146800640 bytes exhausted (tried to allocate 57 bytes) in public_html/wp-includes/rewrite.php on line 1561
  40. Display all WP Errors together during form validation
  41. Updating posts exceeds maximum execution time
  42. Why can I not execute php files under the wp-includes folder?
  43. Why do get_category_by_slug() crashes WordPress 4.8
  44. Headers already sent by
  45. Failed: Filesystem preventing downloads. ( ftpext)
  46. Code snippet to display ID gives critical error
  47. I tried to build a theme from scratch and it crashed everything
  48. Overwrote index.php. When I restored it, I got lots of Notice level errors
  49. 403 forbidden access to my whole site
  50. error log bloated by add_view
  51. Warning: require_once(/home/onetwo/public_html/wp-config.php): [closed]
  52. Unable to locate WordPress content directory
  53. Constant WP_CRON_LOCK_TIMEOUT already defined in /htdocs/wp-config.php
  54. WP Core Update Issue
  55. Cannot upgrade to 4.0 – get SSL certificate error
  56. Error when setting cookie
  57. styles/default.css in markup, where does it come from? [closed]
  58. download count29.php whene loading site [closed]
  59. Warning: call_user_func_array() [function.call-user-func-array]
  60. Parse error: syntax error, unexpected [closed]
  61. My new WordPress blog keeps refreshing in Chrome browser
  62. Need Help Determining Where Header Error is Happening
  63. Undefined index error on options array element?
  64. Getting no Error Log File saved to my local directory, and no debug info displayed in the web browser
  65. How to turn off WP error handling, but turn on php error handling?
  66. Error regarding invalid file permissions for upgrading WordPress version
  67. How to solve the error “Oops! That page can’t be found” when access Portfolio
  68. Replace form field error text?
  69. Publication in wrong category
  70. Suddenly get errors in admin when editing post type
  71. Modifying server’s response to API endpoint
  72. Why does this show up when i try to log in
  73. How can I make error messages in admin
  74. Dashboard widget, screen options/help doesn’t work?
  75. Getting amp; on every single category, post and page title. How to Remove?
  76. Site has fake users registered with a similar pattern in username and email
  77. WordPress fails when my post is larger than 1400 words
  78. Seeing “error” as text on white when accessing admin
  79. Unregister Settings Error
  80. Weird Parse Error on Uploaded File
  81. 500 internal server error with wordpress
  82. call user func array error after moved the site to new server
  83. do_action( ‘init’ ) in wp-settings.php breaks my website. All plugins and themes disabled
  84. WP_Error message
  85. Avoiding “headers already sent” in WordPress
  86. Fatal error: Cannot declare class WP_User_Request, because the name is already in use?
  87. Unexpected error with class-wp-hook.php on WordPress
  88. Fatal error: Call to undefined function wp_raise_memory_limit()
  89. problem ajaxurl – designthemes-core-features
  90. Help with overloading the limits of CPU/RAM issue in a resseler account with wp sites
  91. WordPress “Allowed memory size” on wp-db.php [closed]
  92. Parse error: syntax error, unexpected T_STRING, expecting ‘,’ or ‘;’ [closed]
  93. Whole right area of wordpress admin dashboard not showing
  94. Only specific users timing out
  95. WordPress Customizer not loading
  96. Getting 403 Forbidden Error while trying to edit or delete new posts or existing posts
  97. Creating a function inside a custom WordPress Plugin [closed]
  98. Apache error log lots of connection_refused
  99. Lots of warnings and errors instead of my WordPress site – Synology NAS – Intranet
  100. Critical error after updating my wordpress

Leave a Comment

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)