Thanks for the fast asnwers.

Brajesh:
– delete_user capability is on, and I can Deactivate users using right column box on user’s profile.
– the link is on the menu and the page is not rendered
– disabling “members” plugin nothing changes

Ravi:
This is the error printed with debugging mode on:

Warning: file_exists(): open_basedir restriction in effect. File(/www/mw_qxaacrqcq/anpia.it/wp-content/plugins/bp-deactivate-account/admin/pt-settings/src/class-page.php) is not within the allowed path(s): (/www/MW_qXaacRqcq/:/usr/share/php/:/var/lib/phpuploadtemp/:/var/lib/php5/:/var/lib/wsdlcache/) in /www/MW_qXaacRqcq/anpia.it/wp-content/plugins/bp-deactivate-account/admin/pt-settings/pt-settings-loader.php on line 64 Fatal error: Class ‘Press_Themes\PT_Settings\Page’ not found in /www/MW_qXaacRqcq/anpia.it/wp-content/plugins/bp-deactivate-account/admin/class-admin-helper.php on line 97

can you understand from this? (I can’t)