Plugin gave me fatal error and locked me out of my site

I installed User Registration Aide on my site and when I tried to activate it, I was greeted with the following error message

Fatal error: Call to a member function get_page_permastruct() on null in /home/content/p3pnexwpnas12_data01/90/3730890/html/wp-includes/link-template.php on line 357

I’ve found the link-template.php file on my computer but I’m unsure what to do next. Im completely unable to access my site, thoughtmarket.org. I would greatly appreciate if someone could help me with this ASAP.