Don’t Panic: How To Troubleshoot Your WordPress Site
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This document provides guidance on troubleshooting problems with WordPress sites as a Happiness Engineer. It discusses asking the right questions to identify issues, common types of problems like PHP errors and CSS/JavaScript issues, and techniques for debugging issues. These include checking error logs, browser developer tools, and disabling plugins or themes to isolate the source of problems. The goal is to equip readers to solve issues through a systematic process of identification and testing.
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Don’t Panic: How To Troubleshoot Your WordPress Site
- 1. DON'T PANIC!DON'T PANIC! Troubleshooting like a Happiness Engineer Jordan Gillman - Automattic
- 2. O HAI!O HAI! I'm Jordan
- 3. WHAT DOES A HAPPINESSWHAT DOES A HAPPINESS ENGINEERENGINEER ACTUALLYACTUALLY DO?DO? Engineering Happiness..
- 6. WHOA!WHOA! BACKUP NOW!BACKUP NOW! Updra Plus: wordpress.org/plugins/updra plus/
- 7. SO, WHAT'S THE PROBLEM?SO, WHAT'S THE PROBLEM?
- 9. TROUBLESHOOTING QUESTIONSTROUBLESHOOTING QUESTIONS What page are you on when you notice the problem?
- 10. TROUBLESHOOTING QUESTIONSTROUBLESHOOTING QUESTIONS What page are you on when you notice the problem? What are you trying to do?
- 11. TROUBLESHOOTING QUESTIONSTROUBLESHOOTING QUESTIONS What page are you on when you notice the problem? What are you trying to do? What did you expect would happen?
- 12. TROUBLESHOOTING QUESTIONSTROUBLESHOOTING QUESTIONS What page are you on when you notice the problem? What are you trying to do? What did you expect would happen? What actually happened?
- 13. TYPES OF PROBLEMS TO SOLVETYPES OF PROBLEMS TO SOLVE
- 16. CHECK YOUR DOMAIN/DNSCHECK YOUR DOMAIN/DNS SETTINGSSETTINGS
- 17. CHECK YOUR DOMAIN/DNSCHECK YOUR DOMAIN/DNS SETTINGSSETTINGS whatsmydns.net
- 20. WHAT'S THE FIX?WHAT'S THE FIX? Has the domain expired or been suspended? Is the domain pointing to the correct Name Servers (or IP Address)?
- 21. WHITE SCREEN, 500 SERVERWHITE SCREEN, 500 SERVER ERRORS, AND PHP ERRORSERRORS, AND PHP ERRORS
- 26. RECOVERY MODERECOVERY MODE Since WordPress 5.2
- 29. OK, SO THERE'S A PHPOK, SO THERE'S A PHP PROBLEM...PROBLEM... How do I find out what it is?
- 30. OK, SO THERE'S A PHPOK, SO THERE'S A PHP PROBLEM...PROBLEM... How do I find out what it is? And how do I fix it?
- 31. FINDING THE ERRORSFINDING THE ERRORS
- 34. WP_DEBUG IN WP-CONFIG.PHPWP_DEBUG IN WP-CONFIG.PHP
- 37. UNDERSTANDING A PHP ERRORUNDERSTANDING A PHP ERROR
- 38. Fatal error: Uncaught Error: Call to undefined function comments_templadte() in /app/public/wp- content/themes/twentynineteen/single.php:50 Stack trace: #0 /app/public/wp-includes/template- loader.php(78): include() #1 /app/public/wp-blog- header.php(19): require_once('/app/public/wp-...') #2 /app/public/index.php(17): require('/app/public/wp-...') #3 {main} thrown in /app/public/wp- content/themes/twentynineteen/single.php on line 50
- 39. Fatal error: Uncaught Error: Call to undefined function comments_templadte() in /app/public/wp- content/themes/twentynineteen/single.php:50 Stack trace: #0 /app/public/wp-includes/template- loader.php(78): include() #1 /app/public/wp-blog- header.php(19): require_once('/app/public/wp-...') #2 /app/public/index.php(17): require('/app/public/wp-...') #3 {main} thrown in /app/public/wp- content/themes/twentynineteen/single.php on line 50
- 40. Fatal error: Uncaught Error: Call to undefined function comments_templadte() in /app/public/wp- content/themes/twentynineteen/single.php:50 Stack trace: #0 /app/public/wp-includes/template- loader.php(78): include() #1 /app/public/wp-blog- header.php(19): require_once('/app/public/wp-...') #2 /app/public/index.php(17): require('/app/public/wp-...') #3 {main} thrown in /app/public/wp- content/themes/twentynineteen/single.php on line 50
- 41. Fatal error: Uncaught Error: Call to undefined function comments_templadte() in /app/public/wp- content/themes/twentynineteen/single.php:50 Stack trace: #0 /app/public/wp-includes/template- loader.php(78): include() #1 /app/public/wp-blog- header.php(19): require_once('/app/public/wp-...') #2 /app/public/index.php(17): require('/app/public/wp-...') #3 {main} thrown in /app/public/wp- content/themes/twentynineteen/single.php on line 50
- 42. SOME COMMON PHP ERRORSSOME COMMON PHP ERRORS
- 43. SOME COMMON PHP ERRORSSOME COMMON PHP ERRORS Call to undefined function...
- 44. SOME COMMON PHP ERRORSSOME COMMON PHP ERRORS Call to undefined function... Parse error: syntax error, unexpected '{'...
- 45. SOME COMMON PHP ERRORSSOME COMMON PHP ERRORS Call to undefined function... Parse error: syntax error, unexpected '{'... Fatal error: Allowed memory size of 33565589 bytes exhausted...
- 46. SOME COMMON PHP ERRORSSOME COMMON PHP ERRORS Call to undefined function... Parse error: syntax error, unexpected '{'... Fatal error: Allowed memory size of 33565589 bytes exhausted... Fatal error: Cannot redeclare (function)...
- 47. SOME COMMON PHP ERRORSSOME COMMON PHP ERRORS Call to undefined function... Parse error: syntax error, unexpected '{'... Fatal error: Allowed memory size of 33565589 bytes exhausted... Fatal error: Cannot redeclare (function)... Warning: Cannot modify header information - headers already sent...
- 49. NOW WHAT?NOW WHAT? Switch theme
- 50. NOW WHAT?NOW WHAT? Switch theme Deactivate the problem plugin
- 51. NOW WHAT?NOW WHAT? Switch theme Deactivate the problem plugin Try and edit the problem file?
- 52. WHAT IF YOU CAN'T FIND AWHAT IF YOU CAN'T FIND A SPECIFIC ERROR?SPECIFIC ERROR? The default plugin/theme dance
- 53. HEALTH CHECK &HEALTH CHECK & TROUBLESHOOTING PLUGINTROUBLESHOOTING PLUGIN https://wordpress.org/plugins/health-check/
- 55. WHITE SCREEN, 500 SERVERWHITE SCREEN, 500 SERVER ERRORS, AND PHP ERRORSERRORS, AND PHP ERRORS
- 58. CSS PROBLEMSCSS PROBLEMS Layout is broken
- 59. CSS PROBLEMSCSS PROBLEMS Layout is broken Form elements don't look correct
- 60. CSS PROBLEMSCSS PROBLEMS Layout is broken Form elements don't look correct Elements overlapping
- 62. JAVASCRIPT PROBLEMSJAVASCRIPT PROBLEMS Dynamic elements not appearing
- 63. JAVASCRIPT PROBLEMSJAVASCRIPT PROBLEMS Dynamic elements not appearing Interactions not working
- 68. INSPECT ELEMENTSINSPECT ELEMENTS Drill down to the problem
- 70. SEE (AND EDIT) CSSSEE (AND EDIT) CSS Why is that link Hot Pink!?
- 73. CHECK JAVASCRIPT ERRORSCHECK JAVASCRIPT ERRORS (and warnings)
- 77. COMMON JAVASCRIPTCOMMON JAVASCRIPT PROBLEMSPROBLEMS Uncaught ReferenceError: jQuery is not defined...
- 78. COMMON JAVASCRIPTCOMMON JAVASCRIPT PROBLEMSPROBLEMS Uncaught ReferenceError: jQuery is not defined... TypeError: ‘undefined’ is not a function...
- 79. COMMON JAVASCRIPTCOMMON JAVASCRIPT PROBLEMSPROBLEMS Uncaught ReferenceError: jQuery is not defined... TypeError: ‘undefined’ is not a function... TypeError: Cannot read property ‘length’.
- 81. NOW WHAT?NOW WHAT? Deactivate plugin or theme
- 82. NOW WHAT?NOW WHAT? Deactivate plugin or theme Check for Optimization plugins
- 83. NOW WHAT?NOW WHAT? Deactivate plugin or theme Check for Optimization plugins Try and edit the problem file?
- 84. SPEED AND LOADING PROBLEMSSPEED AND LOADING PROBLEMS
- 86. THAT'S IT!THAT'S IT! You know how to Troubleshoot!
- 87. THAT'S IT!THAT'S IT! You know how to Troubleshoot!