Wordpress presenting errors when editing webpage using elementor and also getting errors at the admin panel

Question

thanks for the help. When editing a page I'm getting these errors:

Warning: Illegal string offset 'pro_widgets' in /home/zzz/xxx/wp-content/plugins/elementor/includes/api.php on line 161

Notice: Array to string conversion in /home/zzz/xxx/wp-content/plugins/elementor/includes/api.php on line 161

Warning: Illegal string offset 'pro_widgets' in /home/zzz/xxx/wp-content/plugins/elementor/includes/api.php on line 164

Deprecated: jquery-slick is deprecated since version 2.7.0! Use Swiper instead. in /home/zzz/xxx/wp-includes/functions.php on line 5401

Also, at the admin panel I'm getting this error:

Notice: WP_Scripts::localize was called incorrectly. The $l10n parameter must be an array. To pass arbitrary data to scripts, use the wp_add_inline_script() function instead. Read How to Debug WordPress for more information. (This message was added in version 5.7.0.) in /home/zzz/xxx/wp-includes/functions.php on line 5663

How can I fix this?

I use elementor plugin and JUpiterX theme.

Thanks!!!