Error when I save settings

Hello,

When I save the settings, the page go to the next link:
https://www.nipopnijazz.com/wp-admin/plugins.php?action=activate&plugin=all-in-one-event-calendar-frontend-submissions%2Fall-in-one-event-calendar-frontend-submissions.php&plugin_status=all&paged=1&s&_wpnonce=4cd7485aea

and in the body’s page appared the next error:
——–
No se puede acceder a este sitio Es posible que la página web en https://www.nipopnijazz.com/wp-admin/plugins.php?action=activate&plugin=all-in-one-event-calendar-frontend-submissions%2Fall-in-one-event-calendar-frontend-submissions.php&plugin_status=all&paged=1&s&_wpnonce=4cd7485aea no funcione temporalmente o se haya trasladado de manera permanente a una nueva dirección web.
ERR_SPDY_PROTOCOL_ERROR
———–

Also I have the plugin Extended Views, and it has same problem

WordPress 5.0.3
PHP server: 5.6.40

Thanks for all

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