Never mind killing System processes. Just do the other “fix” that is listed in the link above.
An alternative is to override the default Server tmp folder path/location is to add this code in your wp-config.php file. Then physically create that /tmp folder under your wp-content folder and set the /tmp folder permissions to 755.
define( 'WP_TEMP_DIR', ABSPATH . 'wp-content/tmp/') ;