Strange Code Showing up webpage

Why am I getting a strange code on top of my webpages. It often happens after searching with the search box. The code then stays at the top of the page. It’s even there when I simply copy and paste the complete link into another browser. I can’t get rid of it unless I edit the page in someway.

This is a sample of the code

Notice: Undefined index: _wsl-app-id in?/srv/users/thecreationspeaks-com/apps/visualverse-thecreationspeaks/public/wp-content/plugins/smart-app-banner/wsl-smart-app-banner.php?on line?42

Notice: Undefined index: _wsl-app-id-ipad in /srv/users/thecreationspeaks-com/apps/visualverse-thecreationspeaks/public/wp-content/plugins/smart-app-banner/wsl-smart-app-banner.php on line 44

Notice: Undefined index: _wsl-affiliate-data in /srv/users/thecreationspeaks-com/apps/visualverse-thecreationspeaks/public/wp-content/plugins/smart-app-banner/wsl-smart-app-banner.php on line 45

Notice: Undefined index: _wsl-app-argument in /srv/users/thecreationspeaks-com/apps/visualverse-thecreationspeaks/public/wp-content/plugins/smart-app-banner/wsl-smart-app-banner.php on line 46

Thanks!

The page I need help with: [log in to see the link]