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(@ahnabil)

i’m getting error 500 or save settings and flush cache

here’s the server log

2018/02/03 16:18:47 [error] 13460#13460: *176 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught Exception: unknown engine  in /home/ahmed/web/example.com/public_html/wp-content/plugins/w3-total-cache/Cdnfsd_Core.php:48
Stack trace:
#0 /home/ahmed/web/example.com/public_html/wp-content/plugins/w3-total-cache/Cdnfsd_CacheFlush.php(199): W3TC\Cdnfsd_Core->get_engine()
#1 /home/ahmed/web/example.com/public_html/wp-includes/class-wp-hook.php(286): W3TC\Cdnfsd_CacheFlush::w3tc_flush_execute_delayed_operations(Array)
#2 /home/ahmed/web/example.com/public_html/wp-includes/plugin.php(203): WP_Hook->apply_filters(Array, Array)
#3 /home/ahmed/web/example.com/public_html/wp-content/plugins/w3-total-cache/CacheFlush_Locally.php(253): apply_filters('w3tc_flush_exec...', Array)
#4 /home/ahmed/web/example.com/public_html/wp-content/plugins/w3-total-cache/CacheFlush.php(188): W3TC\CacheFlush_Locally->execute_delayed_operations()
#5 /home/ahmed/web/example.com/public_html/wp-includes/class-wp-hook.php(284): W3TC\CacheFlush->execute_delayed_operations()
#6 /...
PHP message: PHP Fatal error:  Uncaught Exception: unknown engine  in /home/ahmed/web/example.com/public_html/wp-content/plugins/w3-total-cache/Cdnfsd_Core.php:48
Stack trace:
#0 /home/ahmed/web/example.com/public_html/wp-content/plugins/w3-total-cache/Cdnfsd_CacheFlush.php(199): W3TC\Cdnfsd_Core->get_engine()
#1 /home/ahmed/web/example.com/public_html/wp-includes/class-wp-hook.php(286): W3TC\Cdnfsd_CacheFlush::w3tc_flush_execute_delayed_operations(Array)
#2 /home/ahmed/web/example.com/public_html/wp-includes/plugin.php(203): WP_Hook->apply_filters(Array, Array)
#3 /home/ahmed/web/example.com/public_html/wp-content/plugins/w3-total-cache/CacheFlush_Locally.php(253): apply_filters('w3tc_flush_exec...', Array)
#4 /home/ahmed/web/example.com/public_html/wp-content/plugins/w3-total-cache/CacheFlush.php(188): W3TC\CacheFlush_Locally->execute_delayed_operations()
#5 /home/ahmed/web/example.com/public_html/wp-includes/class-

Viewing 4 replies - 1 through 4 (of 4 total)

Thread Starter ahnabil
(@ahnabil)

6 years, 9 months ago

ok it appears that this occurs only when trying to flush the page cache

Thread Starter ahnabil
(@ahnabil)

6 years, 9 months ago

it appears after enabling cloudflare, that the FSD CDN checkbox is checked, and greyed out, i think thats the issue

View post on imgur.com

ptblank
(@ptblank)

6 years, 8 months ago

Hey @ahnabil

I think your right.

Here’s an article by someone that agrees, with a fix. https://techjourney.net/fix-wordpress-w3-total-cache-w3tc-uncaught-exception-unknown-engine-500-fatal-error/
Stefan Vasiljevic
(@stefanue)

6 years, 7 months ago
Hi There,

i managed to fix this by turning off the “FSD CDN” option from General Settings.

It was a really simple and quick fix.

Step 1:
Right click on grayed-out checkbox -> Inspect

Step 2:
Expand <label> element

Step 3:
Change to following
```
<label>
<input type="hidden" name="cdnfsd__enabled" value="0">
<input class="enabled" type="checkbox" id="cdnfsd__enabled" name="cdnfsd__enabled" value="0"> Enable
</label>
```
Step 4:
Save settings

Step 5:
It’s working

Viewing 4 replies - 1 through 4 (of 4 total)

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