Twitter feeds failing with "Invalid document end"

I have two twitter feeds on our site. When I view the pages that these feeds are on I get the following errors:

The feed from Loyality Blog seems to be broken, because of error "Invalid document end" on line 63.
The feed from Social Media Marketing seems to be broken, because of error "Invalid document end" on line 48.

When I run cron I get the following errors:
FCKeditor 2.6.6
You are using a feature that requires $cookie_domain to be set, but it is not set in your settings.php (either built-in filebrowser or quick uploads are enabled in the Advanced profile).

PDF generation library No PDF tool selected
Please configure it in the PDF settings page.

I'm not sure if they are related to the above issue.