Website went wrong

Hi All,

I’m am new here. My website is https://www.joomtravel.com

I have a setup a website. Every things is ok until last night. But, when I open up my website today, I’ve notice there is an error on my website.

“Warning: Missing argument 2 for ray_bp_core_get_user_displayname() in /home/joomtrav/public_html/wp-content/plugins/buddypress-usernames-only/bp-usernames-only.php on line 40
by “

1. Is it a security issue because I’m wandering why my website suddently went wrong.

2. How to resolve this issue. I really need a step-by-step guideline as I am not in IT background.

Thank you.

Rgds,
kamarul
https://www.joomtravel.com