Title: Fatal Error When Updating post Last modified: April 7, 2018 --- # Fatal Error When Updating post * [mamil](https://wordpress.org/support/users/mamil/) * (@mamil) * [8 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-when-updating-post/) * Hello – * When updating a post I get the fatal error below. I looked into [https://techjourney.net/fix-wordpress-w3-total-cache-w3tc-uncaught-exception-unknown-engine-500-fatal-error/](https://techjourney.net/fix-wordpress-w3-total-cache-w3tc-uncaught-exception-unknown-engine-500-fatal-error/) but, unfortunately, couldn’t find the file /w3tc-config/master.php file. * Fatal error: Uncaught exception ‘Exception’ with message ‘unknown engine ‘ in…/ w3-total-cache/Cdnfsd_Core.php:48 Stack trace: #0 …/plugins/w3-total-cache/Cdnfsd_CacheFlush. php(222): W3TC\Cdnfsd_Core->get_engine() #1 [internal function]: W3TC\Cdnfsd_CacheFlush:: w3tc_flush_execute_delayed_operations(Array) #2 /home/sitejust/www/www/wp-includes/ class-wp-hook.php(286): call_user_func_array(Array, Array) #3 /home/sitejust/ www/www/wp-includes/plugin.php(203): WP_Hook->apply_filters(Array, Array) #4 …/ plugins/w3-total-cache/CacheFlush_Locally.php(253): apply_filters(‘w3tc_flush_exec…’, Array) #5 …/plugins/w3-total-cache/CacheFlush.php(188): W3TC\CacheFlush_Locally- >execute_delayed_operations() #6 …/plugins/w3-total-cache/CacheFlush.php(194): W3TC\CacheFlush->execute_delayed_operations() #7 [internal function]: W3TC\CacheFlush- >execute_delayed_operations_filter( in …/plugins/w3-total-cache/Cdnfsd_Core.php on line 48 * Fatal error: Uncaught exception ‘Exception’ with message ‘unknown engine ‘ in…/ plugins/w3-total-cache/Cdnfsd_Core.php:48 Stack trace: #0 …/plugins/w3-total- cache/Cdnfsd_CacheFlush.php(222): W3TC\Cdnfsd_Core->get_engine() #1 [internal function]: W3TC\Cdnfsd_CacheFlush::w3tc_flush_execute_delayed_operations(Array)# 2 /home/sitejust/www/www/wp-includes/class-wp-hook.php(286): call_user_func_array( Array, Array) #3 /home/sitejust/www/www/wp-includes/plugin.php(203): WP_Hook- >apply_filters(Array, Array) #4 …/plugins/w3-total-cache/CacheFlush_Locally.php( 253): apply_filters(‘w3tc_flush_exec…’, Array) #5 …/plugins/w3-total-cache/CacheFlush. php(188): W3TC\CacheFlush_Locally->execute_delayed_operations() #6 [internal function]: W3TC\CacheFlush->execute_delayed_operations() #7 /home/sitejust/www/ www/wp-includes/class-wp-hook.php(284): call_user_func_array(Array, Array) #8/ home/sitejust/www/www/wp-includ in …/plugins/w3-total-cache/Cdnfsd_Core.php on line 48 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ffatal-error-when-updating-post%2F%3Foutput_format%3Dmd&locale=en_US) to see the link]_ Viewing 4 replies - 1 through 4 (of 4 total) * [victormlj](https://wordpress.org/support/users/victormlj/) * (@victormlj) * [8 years ago](https://wordpress.org/support/topic/fatal-error-when-updating-post/#post-10318538) * Hey [@mamil](https://wordpress.org/support/users/mamil/), * There are a couple of things you can do: * 1) If you are using Cloudflare, you can modify the following: * You can edit: /www/wp-content/w3tc-config/master.php * “cdnfsd.enabled”: “0”, “cdnfsd.engine”: “CloudFlare”, “cdnfsd.debug”: “0”, * 2) Reset the default setting of the plugin and select all the options again. * 3) try to modify the Cdnfsd_CachFlush.php as indicated in a previous post ([Fatal error: Uncaught exception ‘Exception’ with message ‘unknown engine](https://wordpress.org/support/topic/fatal-error-2749/)) * Plugin Contributor [gidomanders](https://wordpress.org/support/users/gidomanders/) * (@gidomanders) * [8 years ago](https://wordpress.org/support/topic/fatal-error-when-updating-post/#post-10318566) * Just saving settings again should fix the issue if you updated the plugin to version 0.9.7. * Thread Starter [mamil](https://wordpress.org/support/users/mamil/) * (@mamil) * [8 years ago](https://wordpress.org/support/topic/fatal-error-when-updating-post/#post-10327744) * Yes, I confirm the issue was fixed with the update of the plugin to version 0.9.7. Thank you. * [bgdstr](https://wordpress.org/support/users/bogdanstratulat/) * (@bogdanstratulat) * [7 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-when-updating-post/#post-10458040) * I am happy to hear that everything has been sorted out. Please feel free to mark this topic as resolved. If you have any other questions, please feel free to ask. * Thank you for using W3 Total Cache. * Kind regards! Bogdan S. Viewing 4 replies - 1 through 4 (of 4 total) The topic ‘Fatal Error When Updating post’ is closed to new replies. * ![](https://ps.w.org/w3-total-cache/assets/icon-256x256.png?rev=1041806) * [W3 Total Cache](https://wordpress.org/plugins/w3-total-cache/) * [Frequently Asked Questions](https://wordpress.org/plugins/w3-total-cache/#faq) * [Support Threads](https://wordpress.org/support/plugin/w3-total-cache/) * [Active Topics](https://wordpress.org/support/plugin/w3-total-cache/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/w3-total-cache/unresolved/) * [Reviews](https://wordpress.org/support/plugin/w3-total-cache/reviews/) * 4 replies * 4 participants * Last reply from: [bgdstr](https://wordpress.org/support/users/bogdanstratulat/) * Last activity: [7 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-when-updating-post/#post-10458040) * Status: not resolved