Notice: Undefined index: act in plugins/linkwelove/Linkwelove.php on line 174

Please, always use define('WP_DEBUG', true); in your dev enviroment https://codex.www.ads-software.com/Debugging_in_WordPress

Solution:
if( isset( $vw['act'] ) && 1 == $vw['act'] )

https://www.ads-software.com/plugins/linkwelove/