MainWP UpdraftPlus Extension - fatal error on activation

Bug
1

Hi All,

I’ve installed v 5.0.2 of the MainWP UpdraftPlus Extension and its showing me a fatal error when I try to activate it.

[26-Mar-2026 16:12:22 UTC] PHP Fatal error:  Uncaught Error: Class "MainWP_Updraftplus_Backups" not found in /var/www/vhosts/domain.uk/dashboard.domain.uk/wp-content/plugins/mainwp-updraftplus-extension/mainwp-updraftplus-extension.php:78
Stack trace:
#0 /var/www/vhosts/domain.uk/dashboard.domain.uk/wp-content/plugins/mainwp-updraftplus-extension/mainwp-updraftplus-extension.php(45): MainWP_Updraftplus_Backups_Extension->__construct()
#1 /var/www/vhosts/domain.uk/dashboard.domain.uk/wp-content/plugins/mainwp-updraftplus-extension/mainwp-updraftplus-extension.php(461): MainWP_Updraftplus_Backups_Extension::get_instance()
#2 /var/www/vhosts/domain.uk/dashboard.domain.uk/wp-content/plugins/mainwp-updraftplus-extension/mainwp-updraftplus-extension.php(403): Mainwp_Updraftplus_Backups_Extension_Activator->activate_this_plugin()
#3 /var/www/vhosts/domain.uk/dashboard.domain.uk/wp-content/plugins/mainwp-updraftplus-extension/mainwp-updraftplus-extension.php(492): Mainwp_Updraftplus_Backups_Extension_Activator->__construct()
#4 /var/www/vhosts/domain.uk/dashboard.bludomainprintweb.uk/wp-admin/includes/plugin.php(2400): include_once('...')
#5 /var/www/vhosts/domain.uk/dashboard.domain.uk/wp-admin/includes/plugin.php(673): plugin_sandbox_scrape()
#6 /var/www/vhosts/domain.uk/dashboard.domain.uk/wp-admin/plugins.php(60): activate_plugin()
#7 {main}
  thrown in /var/www/vhosts/domain.uk/dashboard.domain.uk/wp-content/plugins/mainwp-updraftplus-extension/mainwp-updraftplus-extension.php on line 78

has anyone had this? is there a simple fix - I dont want to start digging in the code to try and find things when I didnt code this :slight_smile:

2

Hey @bpw_drew

1/
Please reinstall or re-upload a fresh copy of the plugin from a new download, then try activation again and tell us whether the same fatal error still occurs.

2/
Can you please confirm whether this file exists on the server and is readable: wp-content/plugins/mainwp-updraftplus-extension/class/mainwp-updraftplus-backups.class.php

3/
Can you please post the community system report from your MainWP Dashboard for review? The report is located in your Dashboard under Info → Server (your-mainwp-dashboard.com/wp-admin/admin.php?page=ServerInformation), on the top right of the page.

Be sure to use the button like the one below; this button hides all your private information:

image

Pressing the button auto-copies the report to your clipboard then just paste it in a reply here.