Hello, I hope this is fine, I have the following error on my website, I am a novice, please how can I solve it.
Undefined index: token
wp-content / mu-plugins / rms_unique_wp_mu_pl_fl_nm.php: 6
wp-includes / class-wp-hook.php: 287
MU plugin: rms_unique_wp_mu_pl_fl_nm.php
The page I need help with: [log in to see the link]