Wordpress website error

Hi

My website is throwing these error.. Can somebody help me how to rectify these issues.?

website link-

Warning: Use of undefined constant AUTH_KEY - assumed 'AUTH_KEY' (this will throw an Error in a future version of PHP) in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/sb_framework/redux-framework/inc/class.redux_instances.php on line 67

Warning: Use of undefined constant SECURE_AUTH_KEY - assumed 'SECURE_AUTH_KEY' (this will throw an Error in a future version of PHP) in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/sb_framework/redux-framework/inc/class.redux_instances.php on line 67

Notice: Trying to get property 'ID' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/all-in-one-schemaorg-rich-snippets/functions.php on line 56

Notice: Trying to get property 'ID' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/add-to-any/add-to-any.php on line 65

Notice: Trying to get property 'ID' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/add-to-any/add-to-any.php on line 78

Notice: Trying to get property 'ID' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/advanced-ads/classes/display-conditions.php on line 1076

Notice: Trying to get property 'post_author' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/advanced-ads/classes/display-conditions.php on line 1084

Notice: Trying to get property 'post_type' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/advanced-ads/classes/display-conditions.php on line 1092

Notice: Trying to get property 'ID' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/advanced-ads/classes/display-conditions.php on line 1076

Notice: Trying to get property 'post_author' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/advanced-ads/classes/display-conditions.php on line 1084

Notice: Trying to get property 'post_type' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/advanced-ads/classes/display-conditions.php on line 1092

Notice: Trying to get property 'ID' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/advanced-ads/classes/display-conditions.php on line 1076

Notice: Trying to get property 'post_author' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/advanced-ads/classes/display-conditions.php on line 1084

Notice: Trying to get property 'post_type' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/advanced-ads/classes/display-conditions.php on line 1092

Notice: Trying to get property 'ID' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/advanced-ads/classes/display-conditions.php on line 1076

Notice: Trying to get property 'post_author' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/advanced-ads/classes/display-conditions.php on line 1084

Notice: Trying to get property 'post_type' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/advanced-ads/classes/display-conditions.php on line 1092

Notice: Undefined variable: bottom_banner in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/themes/adforest/inc/theme_shortcodes/shortcodes/modern2/adforest-category-ads-slider.php on line 493

Notice: Trying to get property 'ID' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/duplicate-page/duplicatepage.php on line 303

Notice: Trying to get property 'ID' of non-object in /home/244554.cloudwaysapps.com/nsbcxussfs/public_html/wp-content/plugins/duplicate-page/duplicatepage.php on line 303