statuses-intro.php:60 – Cannot use object of type WP_Error as array

got this in my email

WordPress version 6.4.2
Active theme: GeneratePress (version 3.3.1)
Current plugin: PublishPress Planner (version 4.0.2)
PHP version 7.4.33

Error Details
=============
An error of type E_ERROR was caused in line 60 of the file /wp-content/plugins/publishpress/statuses-intro.php. Error message: Uncaught Error: Cannot use object of type WP_Error as array in /wp-content/plugins/publishpress/statuses-intro.php:60
Stack trace:
#0 /wp-includes/class-wp-hook.php(324): {closure}(Object(Plugin_Upgrader), Array)
#1 /wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#2 /wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#3 /wp-admin/includes/class-wp-upgrader.php(961): do_action('upgrader_proces...', Object(Plugin_Upgrader), Array)
#4 /wp-admin/includes/class-plugin-upgrader.php(137): WP_Upgrader->run(Array)
#5 /wp-admin/update.php(176): Plugin_Upgrader->install('/home/wplive/we...', Array)
#6 {main}
  thrown