Parse error: syntax error – buddypress – members

So I stupidly decided to delete the following line of code from my Plugin/editor/buddypress/member functions file:

%s {$exclude_users_sql}”, bp_get_user_meta_key( ‘last_activity’ ) ) );

And now i can’t log in to my site at all – front or back end.

All I get it the following message:

Parse error: syntax error, unexpected T_STRING in /var/sites/p/ping-hub.com/public_html/wp-content/plugins/buddypress/bp-members/bp-members-functions.php on line 823

I am complete newbie to this and really need this fixed asap, any suggestions?!

All I wanted to do was remove the display of when members were last active!