Fatal error: Call to undefined function is_multisite()

the quotes: if(function_exists('is_multisite'))

Related Posts:

  1. Showing errors with $wpdb update
  2. Unable to locate WordPress Content directory (wp-content)
  3. How to fix “There has been a critical error on your website. Please check your site admin email inbox for instructions”?
  4. Notice: Use of undefined constant SCRIPT_DEBUG
  5. WordPress Redirecting to wp-admin/install.php
  6. When does remove_filter not work?
  7. This webpage is not available ERR_NAME_NOT_RESOLVED
  8. Error 310 too many redirects after switching domains
  9. How do I set up Debugging?
  10. Error Logs to Diagnose Error 500 in LAMP
  11. Error messages when adding code to function.php or trying to delete inactive plugin files
  12. Does wordpress have an error log?
  13. WP_DISABLE_FATAL_ERROR_HANDLER vs WP_DEBUG ? What to use and when to use to see errors?
  14. Call to undefined function get_header() in index.php
  15. Dashboard Whitescreen of Death?
  16. Unexpected Output: register_activation_hook with namespace
  17. WP Site Only Shows Javascript for Main Page
  18. PHP notice coming from the WordPress core?
  19. Get notified by email when Fatal error occurs on wordpress site?
  20. Call to undefined function
  21. Is there a way to avoid 404 pages in WordPress?
  22. “There doesn’t seem to be a wp-config.php file.” despite wp-config.php in root
  23. Get PHP Fatal error on globalized $wpdb: Call to a member function insert() on a non-object- I have no clue. What to do?
  24. Error Establishing a Database Connection, but credentials are OK
  25. Unable to Upload Files
  26. error: An Unexpected HTTP Error occurred during the API request
  27. What might cause “junk after document element” error?
  28. I am getting an error some times when uploading themes
  29. After upgrading Debian Buster to Bullseye, WordPress sites no longer updating
  30. How do you change error reporting to only show errors in WordPress?
  31. WordPress There is an error log for a transaction we did not do
  32. How to Debug WordPress
  33. is_wp_error is missing error
  34. Error establishing a database connection only on some pages
  35. Deprecated issue in WordPress [closed]
  36. Why getting “The input type is invalid” when accessing edit.php?
  37. 500 error after update
  38. Problem with running javascript in a shortcode
  39. Without access to the FTP, how can I fix the index page?
  40. How to catch all PHP errors with custom error handler?
  41. “load-scripts.php” hangs and times out when plupload is requested
  42. Trying to get property of non-object error with thumbnail
  43. I have an error message coming up after I type in my domain. How Do I get my site back
  44. Blog automatically redirected to error page
  45. Site Address (URL) – causing error 404
  46. 500 error for all pages and post after move localhost to server
  47. Object of class stdClass could not be converted to string in
  48. why would ABSPATH not get defined
  49. 404 Not found error after update to WordPress 5.0
  50. Keep getting this code reparted again and again?
  51. How to trace an Error when it says nothing about any plugin?
  52. WordPress fonts need to upload with Google fonts?
  53. require_once() error after moving WordPressto another server
  54. Method Not Implemented GET to wp-admin/post.php not supported
  55. Removed plugin generating error message
  56. Parse error:syntax error [closed]
  57. When sorting WP_List_Table, table sorts, but I also get SQL errors
  58. Why do these errors appear on my wordpress site? [closed]
  59. WordPress + Buddpyress – troubleshooting server overloading
  60. Error when activating child theme: `failed to open stream: No such file or directory`
  61. Error when trying to logout
  62. WordPress cracked? Posts not found in dashboard
  63. Multiple use wp_logout_url() on page cause ‘header already sent’ error after submit form
  64. How do I fix this: syntax error, unexpected ‘:’, expecting ‘)’
  65. Plugin.php not found
  66. A critical error has occurred on the site
  67. Fatal error for category archives
  68. 403. You don’t have permission to access this resource error
  69. Critical error but refresh fixes it
  70. How to identify the origin of an issue or an unexpected behavior?
  71. Fatal Error: Uncaught Error: call to undefined function get_plugin_data after uploading 2 blog posts(wp-shopify)
  72. WordPress error when update to new version
  73. Forbidden permission and editor error after update to WordPress 5.1.1
  74. Crawl Errors in Search console
  75. How to fix this CORS error?
  76. Regular 503 error every 5 minutes for logged in users
  77. One page is showing the “Index of /” error
  78. Parse error: syntax error, unexpected ”tax_query” in wordpress
  79. What is the source of “HTTP error,” and
  80. WordPress Dashboard visible but site is not after migration
  81. 403 error with no reason
  82. All of my wordpress sites showing †Ù¥
  83. Possible to hide the search engine indexing disabled prompt/error message?
  84. WordPress Error Missing Argument [duplicate]
  85. WordPress installation self deleted in server restart. SQL Tables gone too!
  86. Error updating WordPress, does not ask for FTP password, just error
  87. Post show up as post and pages
  88. Parse error: syntax error, unexpected T_FUNCTION
  89. Error thrown Cannot use object of type WP_Error as array
  90. The ( error_log ) file size is very large
  91. Theme-Check plugin using MY_THEME check error genrate
  92. index page is not loading [closed]
  93. Solve theme installation problem?
  94. Fatal error trace not shown in development setup
  95. Is it possible to empty debug.log programmatically?
  96. File doesn’t exist! in wordpress function.php file while creating new post or page
  97. Change Registration Error Message
  98. Error code 499 on specific cron job
  99. Core error when calling remove_menu_page
  100. Customizing login message