Plugin error message in Version 4.0 register uninstall hook

Hello,

I get this error as well, it my new sever with php 7.2… php 5.6 seems to work fine

Method Plugin_Install_Hooks_Init in file mw-polylang-theme-strings.php should be rewritten. An invalid approach is used! According to WP documentation the callback to run when the hook is called, must be a static method or function.

register_uninstall_hook($this->Path_Get('plugin_file_index'), array($this, 'Uninstall'));

but it should be something like this:

register_uninstall_hook( __FILE__, 'MW_Polylang_Theme_Strings::Uninstall');

Method Plugin_Install_Hooks_Init shall be rewritten to load other required recourses.

        private function Plugin_Install_Hooks_Init(){
            register_activation_hook($this->Path_Get('plugin_file_index'), array($this, 'Install'));
            register_uninstall_hook($this->Path_Get('plugin_file_index'), array($this, 'Uninstall'));
            add_action('upgrader_process_complete', array($this, 'Plugin_Upgrade'), 10, 2);
        }

While the master code is being updated, I commented the line that @wp-apps said BEFORE installing the add-on. Of course, you may have some problems when trying to uninstall.

register_uninstall_hook($this->Path_Get('plugin_file_index'), array($this, 'Uninstall'));