Activation impossible – Fatal error

Hello

I installed the Custom Layout plugin (1.4.6) but as soon as I try to activate it, I get a fatal error in WordPress (5.9.3).

In the back office WordPress displays the following error:

Fatal error: Uncaught Error: Call to a member function stat() on bool in /var/www/html/wp-content/plugins/ssh-sftp-updater-support/class-wp-filesystem-ssh2.php:253 Stack trace: #0 /var/www/html/wp-content/plugins/custom-layouts/includes/core/classss-loader. php(574): WP_Filesystem_SSH2->exists() #1 /var/www/html/wp-content/plugins/custom-layouts/includes/core/class-upgrade.php(34): Custom_Layouts\CoreCSS_Loader::save_css() #2 /var/www/html/wp-content/plugins/custom-layouts/includes/core/class-activator. php(34): Custom_Layouts\Core\Upgrade::upgrade() #3 /var/www/html/wp-content/plugins/custom-layouts/custom-layouts.php(37): Custom_LayoutsActivator::activate() #4 /var/www/html/wp-includes/class-wp-hook.php(307): activate_custom_layouts() #5 /var/www/html/wp-includes/class-wp-hook. php(331): WP_Hook->apply_filters() #6 /var/www/html/wp-includes/plugin.php(474): WP_Hook->do_action() #7 /var/www/html/wp-admin/plugins. php(194): do_action() #8 {main} thrown in /var/www/html/wp-content/plugins/ssh-sftp-updater-support/class-wp-filesystem-ssh2.php on line 253

I also have a test environment with a completely identical WordPress. On this environment, I have no problem to activate the plugin.