error after migrating site

The site has a strange behavior after moving it to a new hosting. Elementor is often very slow. Some changes on the site mainly related to style do not apply. Going into the system information provided by elementor I find this error:
PHP: 2019-01-29 15:06:36 [error X 1] [/ home / public_html / http://www.site.com / wp-content / plugins / elementor / elementor.php :: 97] Can not redeclare elementor_fail_wp_version () ( previously declared in /home/public_html/www.site.com/wp-content/plugins/elementor/elementor.php:97) [array (
‘trace’ => ‘
# 0: Elementor \ Core \ Logger \ Manager -> shutdown ()
‘,
)]

Can you help me ?
Thanks.