Fatal error: Allowed memory size of x bytes exhausted (tried to allocate x bytes) in ...

I installed Hummingbird and WP Smush Pro on my site... and now... I keep getting this error anytime I try accessing any portion of my Wordpress admin area.

I tried editing the wp-config.php file, the .htaccess file, the php.ini file.... nothing works. AND the location always changes... it's not even in the same folder.