EDIT: solved in https://sourceforge.net/p/adminer/bugs-and-features/663/
Hello there, it's bad syntax for CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password'; There is CREATE USER 'newuser'@'localhost' IDENTIFIED BY PASSWORD 'password'; "PASSWORD" is redundant... You can go tou adminer file and find it and remove it. Than it's going to work well.