Can’t Login to Dashboard / Admin

This issue has been solved by:

I deactivated the plugins as you suggested through FTP. I got right in and then started to reactivate 1 by 1 the plug-ins and found the little bugger that was causing the issue.

Quiz And Survey Master, Version 6.4 By ExpressTech

I have been able to reactivate everything else and all is fine! I have logged in and out several times, different browsers and even once just to make sure installed it again, and had to deactivate all plugins again.

As in Support Post: https://www.ads-software.com/support/topic/cant-login-to-dashboard-admin/#post-12285210

This was the original issue:

Notice: Trying to get property of non-object in /home/mymembe1/quiz/wp-includes/post.php on line 4323

Notice: Trying to get property of non-object in /home/mymembe1/quiz/wp-includes/link-template.php on line 49

Notice: Trying to get property of non-object in /home/mymembe1/quiz/wp-includes/link-template.php on line 49

Fatal error: Uncaught Error: Call to a member function get_author_permastruct() on null in /home/mymembe1/quiz/wp-includes/author-template.php:346 Stack trace: #0 /home/mymembe1/quiz/wp-content/plugins/a2-w3-total-cache/lib/W3/SharedPageUrls.php(184): get_author_posts_url(‘1’) #1 /home/mymembe1/quiz/wp-content/plugins/a2-w3-total-cache/lib/W3/PgCacheFlush.php(119): W3_SharedPageUrls->get_post_author_urls(‘1’, 0) #2 /home/mymembe1/quiz/wp-content/plugins/a2-w3-total-cache/lib/W3/CacheFlushLocal.php(103): W3_PgCacheFlush->flush_post(49) #3 /home/mymembe1/quiz/wp-content/plugins/a2-w3-total-cache/lib/W3/CacheFlush.php(106): W3_CacheFlushLocal->pgcache_flush_post(49) #4 /home/mymembe1/quiz/wp-content/plugins/a2-w3-total-cache/lib/W3/Plugin/PgCache.php(259): W3_CacheFlush->pgcache_flush_post(49) #5 /home/mymembe1/quiz/wp-includes/class-wp-hook.php(288): W3_Plugin_PgCache->on_post_change(49, Object(WP_Post)) #6 /home/mymembe1/quiz/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array) #7 /home/mymembe1/quiz/wp- in /home/mymembe1/quiz/wp-includes/author-template.php on line 346

I have moved on to a different plug-in that has not crashed my site.

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