I have all the sudden a fatal error on two sites

@andreios It seem like your (auto) updating from version 3.3.0 to 3.3.1 is incomplete. WP-Optimize no longer uses WPO_WebP_Cron_Scheduler class and it seems the update removed that class file successfully, but didn’t update the file that calls it.

Please do a manual overwrite of /wp-content/plugins/wp-optimize folder or do fresh install

A
grep -i WPO_WebP_Cron_Scheduler wp-content/plugins/wp-optimize -R
showed nothing. So I guess it is not there.
Is it possible that some strange cache has like opcache has old this up?
I had a strange problem with these site too. I set the WP_DEBUG and WP_DEBUG_LOG constant in wp-config.php as I first noticed the error. After disabling WP-OPTIMIZE I set both WP_DEBUG_LOG and WP_DEBUG to ‘false’. But is was still set for like an hour or so, and then turned to off for no reason on its own.
The WP_DEBUG_DISPLAY constant is still set according to the DEBUG plugin where I can see the settings. But WP_DEBUG_DISPLAY is not set in wp-config.php!

I have just activated the plugin again and no error at all.
I have no explanation.

i have activated cache with wp-optimize and got this error in the log.

PHP message: [ERROR] : WP_CACHE constant is not present in wp-config.php; PHP message: [ERROR] : WP_CACHE constant is not present in wp-config.php

I have set it manually, error is gone.

Can you download and install a fresh copy of the plugin?

happened to me to, also getting a popup when i try to check the WebP option: Required WebP shell functions are not available on server.

and it does available on my server

• This reply was modified 8 months ago by Sara.

Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, WpOrg\Requests\Utility\CaseInsensitiveDictionary given in /home/newganus/domains/green-israel.co.il/public_html/wp-content/plugins/wp-optimize/includes/class-wp-optimize-gzip-compression.php:64
Stack trace:
#0 /home/newganus/domains/green-israel.co.il/public_html/wp-content/plugins/wp-optimize/includes/class-wp-optimize-gzip-compression.php(120): WP_Optimize_Gzip_Compression->get_headers_information()
#1 /home/newganus/domains/green-israel.co.il/public_html/wp-content/plugins/wp-optimize/includes/class-wp-optimize-admin.php(357): WP_Optimize_Gzip_Compression->is_gzip_compression_enabled()
#2 /home/newganus/domains/green-israel.co.il/public_html/wp-includes/class-wp-hook.php(324): WP_Optimize_Admin->output_cache_gzip_tab()
#3 /home/newganus/domains/green-israel.co.il/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#4 /home/newganus/domains/green-israel.co.il/public_html/wp-includes/plugin.php(517): WP_Hook->do_action()
#5 /home/newganus/domains/green-israel.co.il/public_html/wp-content/plugins/wp-optimize/includes/class-wp-optimize-admin.php(159): do_action()
#6 /home/newganus/domains/green-israel.co.il/public_html/wp-content/plugins/wp-optimize/includes/class-wp-optimize-admin.php(108): WP_Optimize_Admin->display_admin_page()
#7 /home/newganus/domains/green-israel.co.il/public_html/wp-includes/class-wp-hook.php(324): WP_Optimize_Admin->display_admin()
#8 /home/newganus/domains/green-israel.co.il/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#9 /home/newganus/domains/green-israel.co.il/public_html/wp-includes/plugin.php(517): WP_Hook->do_action()
#10 /home/newganus/domains/green-israel.co.il/public_html/wp-admin/admin.php(259): do_action()
#11 {main}
? thrown

I have a clean copy of WP-Optimze in both Websites installed.

After I added WP_CACHE in wp-config.php the entry is now gone and a new double entry appeared in both Websites, like this:

define('WP_CACHE', true); // WP-Optimize Cache
define('WP_CACHE', true); // WP-Optimize Cache
I have remove one line of this. Everything seems fine now.

To the strange error I got with WPO_WebP_Cron_Scheduler I can only say that I had strange errors occurred on other web-hosts too. Like cached constants and old mysql passwords. But a restart of PHP FPM always helped.

I had PHP 8.2.17installed which came with Plesk.

As a solution I have downgraded to PHP 8.1.27. With this version everything works as expected.

My opcache settings where always stock.

I’ve also ?I have downgraded to PHP 8.1.27 and it still not working for me

I’ve reinstall version 3.2.13 and everything works now.