Headers already sent in Pluggable.php / homepage and wp-login error

It is usually because there are spaces, new lines, or other stuff before an opening tag, typically in wp-config.php. This could be true about some other file too, so please check the error message, as it will list the specific file name where the error occurred.

Other Resources:

Related Posts:

  1. Headers Already Sent
  2. Should I use spl_autoload_register() in my plugin?
  3. WP-CLI – Selecting PHP version
  4. error_log() output for print_r() appearing on page
  5. When to use Exceptions vs Error Objects vs just plain false/null
  6. Hide php Notices in Dashboard
  7. Upgrading PHP version results in “Use of undefined constant WP_CONTENT_DIR” warning?
  8. WordPress “Link has expired” error on updating posts
  9. How to stop loading multiple copies of jquery
  10. Creating a WordPress form with a PHP script and default header
  11. Notice: Constant already defined in wp-config.php on (non-existent) line?
  12. StudioPress: add meta tag to every page [closed]
  13. Fatal error: Call to undefined function wpsc_cart_item_count()
  14. Why when I instantiate wp_error in a validation method my user registration method stops working?
  15. Error when requesting password reset email – wp authentication
  16. After upgrading to PHP 7.0 my contact form outputs error
  17. Using PHP to toggle stylesheet and header image, set in cookie
  18. Mysterious HTTP 404 header in my own scripts
  19. Does WordPress have a built in reference to the PHP version its running under? [closed]
  20. Conditional Header in wordpress
  21. add_image_size for header_image
  22. How to find error in my code when the error message is pointing to WP core file?
  23. get_term_link() returns correct – But illogical error-messages disturb
  24. PHP Warning: Attempt to read property “term_id” on bool
  25. Responsive Header for Phone
  26. Mute Debug Messages from Plugins
  27. WordPress Script stops suddenly
  28. A non-numeric value encountered in /wp-includes/functions.php on line 68
  29. Error on wp_default_style After upgrade to php 7
  30. My php header() function is not working [closed]
  31. wp-comments-post.php file returns a blank page
  32. Getting error when using wp_insert_post()
  33. Error: options page not found
  34. Insert custom PHP head above in WP pages
  35. Is_front_page inside header.php is always returning true
  36. Does wordpress templates always in files or in database?
  37. Which is the correct way to conditionally enqueue a CSS file?
  38. “Undefined index” error when saving empty array with checkboxes
  39. Having Issue on Redirecting With Session in WordPress
  40. linking stylesheets and scripts with functions.php
  41. Preg_Match(): compilation failed unknown property name
  42. customize wordpress database error page
  43. unknown issue in ‘header.php’ preventing theme from displaying fully
  44. How can I use a sliced image As banner? [closed]
  45. Add meta tags to a custom header
  46. How to end a while loop when used in a fetch assoc function [closed]
  47. After adding my website to a new server, I keep getting a unexpected end of file error, but the file is identitcal to it’s original source
  48. Is this a correct usage of ob_start() in my WordPress project?
  49. Array to string conversion error in PHP 7.2 when returning user role as class
  50. javascript variable to wordpress php variable
  51. Change header on pages displaying taxonomy items
  52. Custom CSV exporter – Cannot modify header information – headers
  53. Angular not defined [closed]
  54. Custom functions for string data calculations
  55. Help with accessing wp-admin page and resolving error messages
  56. Blog suddenly shows Archive instead of index page
  57. How do you remove header sitewide from mobile only?
  58. Illegal string offset in PHP function in via Theme Customizer
  59. How do I use an iFrame for my header in WordPress twenty seventeen?
  60. Cannot find the php_ini configuration file to find my error log to see why my code is not working
  61. Reliable way to add nonce to HTTP Header in WordPress?
  62. Fatal error login WordPress [duplicate]
  63. I am having errors with checkout on wordpress
  64. How to remove get_header From all single pages in wordpress with functions.php without plugin?
  65. Display values of current POST request on page
  66. Intermittent 503 Service Unavailable Error
  67. Trying to get property ‘ID’ and ‘post_author’ of non-object error
  68. HELP: cannot log into wordpress. PHP error
  69. Modifying child theme’s header
  70. Add my footer menu to the header
  71. PHP error on local server install
  72. WordPress files break if I edit them, but adding a closing PHP tag fixes it
  73. Site title not showing. Please help me
  74. PHP Error in WordPress Theme
  75. WordPress database error only while loading page for 1st time
  76. This occurs when I open admin or front on localhost
  77. Is there a way to search for a missing endif?
  78. style.min.css code issue
  79. PHP is_embed error showing up
  80. WordPress 3.0 PHP Error – notice WordPress_product_Type was called incorrectly
  81. Too few arguments for printf() [closed]
  82. syntax error unexpected ‘}’ at 364 line
  83. Troubleshooting “loopback requests that take too long”
  84. Data inserted in database, but ajax calls error function
  85. Parse error: syntax error, unexpected ‘}’ in C:\wamp64\www\Proiect\aplicatie\user_check.php on line 18 [closed]
  86. Query Concatenation
  87. What does that mean: cannot use a scalar value as an array [closed]
  88. problem with php function error
  89. PHP warning Invalid argument supplied for foreach() on custom page template
  90. WordPress White Screen Error
  91. Please help! Parse error: syntax error, unexpected ‘
  92. Not able to see the error [closed]
  93. PHP warning $post->ID is null
  94. Dynamic Email Handler with ‘header (“Location: …’
  95. Getting invalid user ID error when creating a new user with wp_insert_user
  96. Error when loading Dashboard
  97. PHP Warning: Undefined array key “HTTP_REFERER”
  98. PHP Warning: Undefined array key “VirtualHostSubMenu” in index.php
  99. Warning: Undefined variable $post_id
  100. There has been a critical error on this website – wordpress issue after upgrading PHP