cannot log in plugin error cannot rename fatal error

Hi, I am getting the following error when trying to log into my
website:

AWPCP SQL Error Errno: [256] SQLError:(2002) No such file or
directory
Query : INSERT INTO wp_posts SET post_author=’1′,
post_date=’2020-06-09′, post_date_gmt=’2020-06-09′,
post_content='[AWPCPSHOWAD]’, post_title=’Show Ad’, post_excerpt=”,
post_status=’publish’, comment_status=’closed’, post_name=’show-ad’,
to_ping=”, pinged=”, post_modified=’2020-06-09′,
post_modified_gmt=’2020-06-09′, post_content_filtered='[AWPCPSHOWAD]’,
post_parent=’3044′, guid=”, post_type=’page’, menu_order=’0′
Called by line 2367 in file /index.php, error in
/nfs/c10/h05/mnt/142753/domains/rufregistry.com/html/wp-content/plugins/another-wordpress-classifieds-plugin/functions_awpcp.php
at line 27, PHP 5.6.21 (Linux)
Aborting…

This started happening after I attempted to update the plugin. Now I
am locked out of the admins back end and not sure how to fix. Since I
can’t connect to the back end anymore, I cannot see what the versions
are.

I reached out to the AWPCP people and they suggested I ask word press to restore to previous version (they can’t do anything on their end I am told).

I tried renaming the FTP file but then I get a fatal error and still cannot log in.

Please help!

The page I need help with: [log in to see the link]