There are two possible fixes for this,
1) If you can, edit the wp-config.php file and find this line of code
"/** Sets up WordPress vars and included files. */require_once(ABSPATH. 'wp-settings.php');"
Add "error_reporting(0);" underneath it without the quotations.
Then re-upload the wp-config.php file back to the server again, that should resolve the issue.
2) If you are using CPanel (Control Panel) for managing your hosting, you can turn off "display_errors" within the php.ini configuration and that should also fix it