A lot of errors with define (wp-debug true) in wp-config . php

I am getting all those errors from the site iq-design.eu
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; WDS_OnPage has a deprecated constructor in /var/www/vhosts/holistic-therapies.gr/iq-design.eu/wp-content/plugins/wpmu-dev-seo/wds-files/wds-onpage/wds-onpage.php on line 8

Notice: Trying to get property of non-object in /var/www/vhosts/holistic-therapies.gr/iq-design.eu/wp-content/plugins/ultimate-branding/ultimate-branding-files/modules/favicons.php on line 252
Notice: Undefined index: cart in /var/www/vhosts/holistic-therapies.gr/iq-design.eu/wp-content/plugins/marketpress/includes/public/class-mp-public.php on line 88

Notice: Undefined index: checkout in /var/www/vhosts/holistic-therapies.gr/iq-design.eu/wp-content/plugins/marketpress/includes/public/class-mp-public.php on line 92

Notice: Undefined index: order_status in /var/www/vhosts/holistic-therapies.gr/iq-design.eu/wp-content/plugins/marketpress/includes/public/class-mp-public.php on line 96
class="home page page-id-10868 page-template-default logged-in admin-bar no-customize-support et_pb_button_helper_class et_fullwidth_secondary_nav et_vertical_nav et_vertical_fixed et_show_nav et_cover_background et_secondary_nav_enabled et_secondary_nav_two_panels et_pb_side_nav_page et_pb_gutter windows et_pb_gutters3 et_primary_nav_dropdown_animation_fade et_secondary_nav_dropdown_animation_fade et_pb_footer_columns4 et_header_style_split et_pb_pagebuilder_layout et_right_sidebar gecko mp-cart mp-checkout mp-order-status">

I have also activate the support in the site...