Invalid CSRF token. Send the form again. If you did not send this request from Adminer then close this page.
I’ve been scratching my head over this. Adminer runs fine on the many Ubuntu systems I’ve installed it on (with the exception of one), but everytime I use Centos, I get this error. Turns out, it’s a permissions issue. If you are getting this error related to Adminer or other php programs that use a CSRF token, check your php sessions folder. If you are not sure, put in a php file, and it will list your sessions location. Usually something like /var/lib/php/session. Make sure that folder exists, and that the group is set the same as your web server. So if that’s Nginx on Ubuntu that would be www-data. Centos it would be nginx. Apache, apache, and so forth. Then change the group and the location for your system and run the following:
chgrp www-data /var/lib/php/session
Adminer should be happy now.