v3.0.0 Critical Error

Hi @rjadev, thanks for getting in touch and sharing the error message. To help you look into this further, please can you share the following:

1. Your Site Health information which will help us to see if anything obvious stands out from your setup.
2. Do you encounter the same when accessing from an Incognito window?
3. Where do you encounter this error?

Once you have shared the above I can perform some checks on my side to see if I can see what the cause is. We can also try some troubleshooting steps if needed. Let me know if you have any questions at this time.

Hi @adamdunnage
Same problem here with a very old test installation (I had to manually disable performance-lab to access WP)
Here are my site health data:

wp-core

version: 6.5.2
site_language: en_US
user_language: en_US
timezone: +00:00
permalink: /%year%/%monthnum%/%day%/%postname%/
https_status: true
multisite: false
user_registration: 0
blog_public: 0
default_comment_status: open
environment_type: production
user_count: 1
dotorg_communication: true wp-paths-sizes

wordpress_path: /home/xxxxxxxxxx/qqqqqqqqq
wordpress_size: 96.74 MB (101434436 bytes)
uploads_path: /home/xxxxxxxxxx/qqqqqqqqq/wp-content/uploads
uploads_size: 2.15 MB (2253702 bytes)
themes_path: /home/xxxxxxxxxx/qqqqqqqqq/wp-content/themes
themes_size: 13.07 MB (13701238 bytes)
plugins_path: /home/xxxxxxxxxx/qqqqqqqqq/wp-content/plugins
plugins_size: 162.94 MB (170857544 bytes)
database_size: 3.12 MB (3266369 bytes)
total_size: 278.01 MB (291513289 bytes) wp-dropins (1)

object-cache.php: true wp-active-theme

name: Storefront (storefront)
version: 4.5.5
author: Automattic
author_website: https://woocommerce.com/
parent_theme: none
theme_features: core-block-patterns, widgets-block-editor, post-thumbnails, automatic-feed-links, custom-logo, menus, html5, custom-background, custom-header, site-logo, title-tag, customize-selective-refresh-widgets, wp-block-styles, align-wide, editor-styles, editor-font-sizes, editor-style, responsive-embeds, amp, woocommerce, wc-product-gallery-zoom, wc-product-gallery-lightbox, wc-product-gallery-slider, starter-content, widgets
theme_path: /home/xxxxxxxxxx/qqqqqqqqq/wp-content/themes/storefront
auto_update: Enabled wp-themes-inactive (3)

Twenty Seventeen: version: 3.6, author: the WordPress team, Auto-updates enabled
Twenty Twenty-Four: version: 1.1, author: the WordPress team, Auto-updates disabled
Twenty Twenty-Three: version: 1.4, author: the WordPress team, Auto-updates disabled wp-plugins-active (7)

Coming Soon Page, Maintenance Mode, Landing Pages & WordPress Website Builder by SeedProd: version: 6.17.4, author: SeedProd, Auto-updates enabled
Google Analytics for WooCommerce: version: 2.0.6, author: WooCommerce, Auto-updates enabled
Loginizer: version: 1.8.4, author: Softaculous, Auto-updates enabled
WooCommerce: version: 8.7.0, author: Automattic, Auto-updates enabled
WooCommerce PayPal Checkout Gateway: version: 2.1.3, author: WooCommerce, Auto-updates enabled
WooCommerce Shipping & Tax: version: 2.5.4, author: WooCommerce, Auto-updates enabled
Yoast SEO: version: 22.5, author: Team Yoast, Auto-updates enabled wp-plugins-inactive (7)

Akismet Anti-spam: Spam Protection: version: 5.3.2, author: Automattic - Anti-spam Team, Auto-updates enabled
AWS for WordPress: version: 4.3.2, author: AWS Labs, WP Engine, Auto-updates enabled
Hello Dolly: version: 1.7.2, author: Matt Mullenweg, Auto-updates enabled
Performance Lab: version: 3.0.0, author: WordPress Performance Team, Auto-updates disabled
WooCommerce Admin: version: 3.3.2, author: WooCommerce, Auto-updates enabled
WooCommerce Blocks: version: 11.7.0, author: Automattic, Auto-updates enabled
WooCommerce PayPal Payments: version: 2.6.1, author: WooCommerce, Auto-updates disabled wp-media

image_editor: WP_Image_Editor_GD
imagick_module_version: Not available
imagemagick_version: Not available
imagick_version: Not available
file_uploads: 1
post_max_size: 8M
upload_max_filesize: 2M
max_effective_size: 2 MB
max_file_uploads: 20
gd_version: 2.3.3
gd_formats: GIF, JPEG, PNG, WebP, BMP, AVIF, XPM
ghostscript_version: 9.25 wp-server

server_architecture: Linux 3.10.0-962.3.2.lve1.5.26.4.el7.x86_64 x86_64
httpd_software: Apache
php_version: 8.1.22 64bit
php_sapi: litespeed
max_input_variables: 1000
time_limit: 30
memory_limit: 128M
admin_memory_limit: 256M
max_input_time: 60
upload_max_filesize: 2M
php_post_max_size: 8M
curl_version: 7.87.0 OpenSSL/1.1.1d
suhosin: false
imagick_availability: false
pretty_permalinks: true
htaccess_extra_rules: true
current: 2024-04-17T06:43:36+00:00
utc-time: Wednesday, 17-Apr-24 06:43:36 UTC
server-time: 2024-04-17T06:43:34+00:00 wp-database

extension: mysqli
server_version: 5.7.36-cll-lve
client_version: 5.7.42
max_allowed_packet: 268435456
max_connections: 600 wp-constants

WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /home/xxxxxxxxxx/qqqqqqqqq/wp-content
WP_PLUGIN_DIR: /home/xxxxxxxxxx/qqqqqqqqq/wp-content/plugins
WP_MEMORY_LIMIT: 40M
WP_MAX_MEMORY_LIMIT: 256M
WP_DEBUG: false
WP_DEBUG_DISPLAY: true
WP_DEBUG_LOG: false
SCRIPT_DEBUG: false
WP_CACHE: false
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_ENVIRONMENT_TYPE: Undefined
WP_DEVELOPMENT_MODE: undefined
DB_CHARSET: utf8mb4
DB_COLLATE: undefined wp-filesystem

wordpress: writable
wp-content: writable
uploads: writable
plugins: writable
themes: writable

@ste18k Thanks for the input. Do you recall what version of the plugin you were using prior to upgrading?

Note also that there is an open GitHub issue in relation to this:
https://github.com/WordPress/performance/issues/1150

Hi @jamesosborne
No I don’t know what version was installed before the upgrade (it’s a test installation and I didn’t login since months). I think auto-updates were enabled also for the performance-lab plugin (otherwise it could not have been updated to version 3.0).
If this information is important for you to debug the issue, later today I can try to restore a backup and check the exact version of the plugin. Just let me know if you need it or not.

Appreciate the update @ste18k. I’ll perform some checks on this, while the team are aware as per the GitHub issue. I’ll certainly be in touch for additional insights. Thank you!

Same here, plugin from auto upgrade

This error causing my website inaccessible

[16-Apr-2024 03:29:26 UTC] PHP Fatal error: Cannot declare class Perflab_Server_Timing_Metric, because the name is already in use in /home/proz5825/public_html/wp-content/plugins/performance-lab/includes/server-timing/class-perflab-server-timing-metric.php on line 14 [16-Apr-2024 03:29:26 UTC] PHP Fatal error: Cannot declare class Perflab_Server_Timing_Metric, because the name is already in use in /home/proz5825/public_html/wp-content/plugins/performance-lab/includes/server-timing/class-perflab-server-timing-metric.php on line 14 [16-Apr-2024 04:51:29 UTC] PHP Fatal error: Cannot declare class Perflab_Server_Timing_Metric, because the name is already in use in /home/proz5825/public_html/wp-content/plugins/performance-lab/includes/server-timing/class-perflab-server-timing-metric.php on line 14 [16-Apr-2024 04:51:30 UTC] PHP Fatal error: Cannot declare class Perflab_Server_Timing_Metric, because the name is already in use in /home/proz5825/public_html/wp-content/plugins/performance-lab/includes/server-timing/class-perflab-server-timing-metric.php on line 14 [16-Apr-2024 06:05:11 UTC] PHP Fatal error: Cannot declare class Perflab_Server_Timing_Metric, because the name is already in use in /home/proz5825/public_html/wp-content/plugins/performance-lab/includes/server-timing/class-perflab-server-timing-metric.php on line 14

Sorry to hear that @masedinet. You can manually remove the plugin directory in order to restore access to your site. You’ll find it on a typical install at wp-content/plugins/performance-lab.

After restoring access, it would be great if you could share your Site Health information here within this support topic. This may provide some further insights into any possible cause.