artsvi91

“what is device cache?”
safari->clear cache

problem solved, when I clean device cache, and its not about wp_nonce_field, because even without that when I send ajax to admin-ajax.php, it send back 400 or 404, so its not about wrong/cached wp_nonce

понял, принял, сработало !)))
плагин крутой, все работает отлично

Thank you for fast response, you`re cool
About

“And my second question, for example I have a user registered via my website registration form, and now he wont to accept his facebook account to his profile to log in via that, how can I realize that functionality.”

what you mean then say “Social account linking interface”, is facebook or your plugin have special library or code for that, or I must realize that functionality?

I found answer, in plugin index.php file

<?php
/*
Plugin Name: ???
Desc. etc
*/
?>
<?php //my code ?>

This is not correct

<?php
/*
Plugin Name: ???
Desc. etc
*/
//my code ?>

This one work correct

Can it happened because there is not enought memory in server hard disk?

Even when I deactivate plugin site work, not perfect, but same like before I start my project.

Nothing in logs

I change plugin name EA Gallery -> EA
Reaname Plugin folder ea_gallery -> ea
Comment all code in /* */
Still when I activate my plugin, website have that issue

Yes I try, nothink happens