Fatal error: Call to undefined function request_filesystem_credentials()

Most likely some files are missing or corrupted. This can happen on new installs. The solution is to download the latest version of WordPress then access your site using FTP and delete directories “wp-includes” and “wp-admin” and then upload fresh copies of directories “wp-includes” and “wp-admin”.

https://wordpress.org/download/

Related Posts:

  1. How to fix empty dashboard issue in WordPress?
  2. Fatal error: Call to undefined function wp() in ../wp-blog-header.php?
  3. Call to undefined function nocache_headers() [closed]
  4. The famous WordPress white screen of death
  5. How do I “fix” a wp-blog-header.php error message?
  6. Blank/White Screen on Frontend but Accessible backend?
  7. PHP Fatal error: Cannot call overloaded function for non-object in wp-includes/capabilities.php [closed]
  8. current_user_can on WordPress 3.1.1
  9. WordPress White Page with Certain Database
  10. Memory issues – Fatal error: out of memory – plugins?
  11. PHP Fatal error: Call to undefined function WP_Filesystem() [closed]
  12. What does this mean: Object of class WP_Error could not be converted to string
  13. How to customize the critical error message?
  14. 500 Error only one one page in the WP admin
  15. How to make my plugin code die gracefully
  16. Fatal error…Please help me
  17. Fatal error after updating to WordPress 5
  18. Revslider error. Impossible to enter admin dashboard [closed]
  19. Fatal error after update [closed]
  20. White screen of death after an auto update of WordPress
  21. Fatal Error after migrating WordPress site from one host to another
  22. WordPress problem with fatal error
  23. After Plugin deinstallation, Login impossible and line50 error
  24. Need help decrypting error and warning messages
  25. WordPress crashed during update
  26. Fatal error: Cannot redeclare get_header_image() (previously declared in [closed]
  27. locked out of wordpress site ‘warning: require once’
  28. Can’t access my site due to fatal error [closed]
  29. White screen after a couple hours?
  30. My site is not working because of this: Fatal error: Cannot redeclare be_themes_contact_authentication [closed]
  31. Fatal error: Uncaught Error: Call to undefined function do_action_ref_array() when using wp_signon function
  32. Allowed memory size exhausted
  33. Fatal error: Call to undefined function the_archive_title ()
  34. Fatal error: Call to undefined function reset_mbstring_encoding
  35. WP_Error with get_category_parents
  36. Fatal Error Class ‘WP_Widget_Pages’ not found in /home/****/public_html/wp-includes/class-wp-widget-factory.php
  37. Fatal error in wordpress htdocs
  38. failed to open stream – wp-includes/blocks/file.php
  39. WordPress critical error (tried plugin + debug!)
  40. Not able to access admin console after Installing and activating a plugin
  41. Fatal error: Uncaught Error: Class ‘WP_REST_Meta_Fields’ not found in
  42. Uncaught Stripe\Exception\SignatureVerificationException: Unable to extract timestamp and signatures from header
  43. unable to edit any page of my wordpress website
  44. How to remove theme that caused WordPress to crash?
  45. Fatal error: Uncaught Error: Call to undefined function twentynineteen_post_thumbnail()
  46. Php Fatal error. Blank wordpress admin panel
  47. Recoverable fatal error: Object of class WP_Error could not be converted to string in /home/xyz/mysite.com/wp-includes/formatting.php on line 3796
  48. How to fix wordpress white screen of death a cause bad php code?
  49. Catchable fatal error: Object of class WP_Error could not be converted to string in
  50. WordPress site suddenly stopped working
  51. wp search-replace inside site’s directory bring PHP fatal error
  52. WordPress Fatal Error
  53. Blank page and 301 redirect
  54. White Screen of Death error
  55. WordPress displays 500 error on PHP errors
  56. WSOD on 4.1.1 after migrating from Bluehost to Dreamhost
  57. Object of class WP_Post could not be converted to string
  58. Fatal error: Call to undefined function term_exists()
  59. Call to undefined function is_blog_installed(), after creating functions.php [closed]
  60. Parse error: syntax error, unexpected T_FUNCTION on plugins page
  61. Blank screen at login/logout – tried everything!
  62. Fatal error: Can’t use method return value in write context
  63. Fatal error: Allowed memory size of 94371840 bytes exhausted (tried to allocate 42240 bytes) in /home/dh_w7t9sk/morleywines.com/wp-content/plugins/
  64. HELP! Fatal Error? I can’t access the Dashboard. How do I regain access? [closed]
  65. Flamingo’s Fatal error: Allowed memory size of 134217728 … wp-includes/wp-db.php on line 2516 [closed]
  66. Fatal error: Uncaught Error: Call to undefined function wpcf7
  67. How to fix Fatal Error in wp-includes/meta.php after upgrade to PHP 8
  68. Call to undefined function create_function()
  69. Fatal error: Uncaught Error: Call to undefined method Elementor\Utils::is_ajax() [closed]
  70. “CRITICAL Object of class WP_Error could not be converted to string” using templates with twig
  71. WordPress core files – PHP Warning: file_exists(): open_basedir restriction in effect
  72. PHP Notice: Undefined offset: 1 with array when reading data
  73. Weird PHP error: ‘Can’t use function return value in write context’
  74. A fatal error has been detected by the Java Runtime Environment. EXCEPTION_ACCESS_VIOLATION
  75. Does wordpress have an error log?
  76. wp_ob_end_flush_all and wp_suspend_cache_addition()
  77. Why “Call to a member function on a non-object” in plugin only?
  78. White screen of death on admin and other dashboard pages
  79. Upgrade to 3.4 error: Call to undefined function get_option()
  80. Fatal Errors on pluggable.php
  81. Using $this from child class inside shortcode function
  82. Can’t access site after plugin activation
  83. How to prevent PHP fatal error if plugin hasn’t been enabled and a method is called in theme file?
  84. Fatal error: Cannot redeclare admin_notice() [closed]
  85. Specify multiple categories for custom post template – FATAL ERROR
  86. White Screen on Site but wp-admin OK
  87. Fatal error: Uncaught Error: Call to undefined function wp() in /home/nr4dxonhypyy/public_html/wp-blog-header.php:16
  88. Critical error – can’t post comments
  89. Error while loading wordpress site “Fatal error: Uncaught Error: Call to undefined function twentytwentyone_the_html_classes() in /home
  90. Unable to edit with Elementor
  91. Uncaught Error: Call to undefined function wp_get_current_user() in
  92. Warning and fatal error
  93. Fatal Error (Call to a member function… ) on production site, but not development site
  94. I’m getting Call to undefined function wp_parse_list() out of the blue
  95. admin-post.php results on white screen after form submission
  96. How to solve notorious ‘Error Establishing a Database Connection’ [closed]
  97. Front-end major break after upgrade PHP 8.0 [closed]
  98. Fatal error trace not shown in development setup
  99. Unable to access WPadmin, website down
  100. Saving metabox updates causing fatal error