I have gotten rid of the error by adding '' in the brackets. Now when I open the Newsletter section nothing happems no matter what I click. As far as I can see I am meant to click 'Create' but nothing happens.
Am trying to do the following but I don't have a templates file in my sites?
Templates are created in mysite/templates/email. So for example, if you created Newsletter.ss inside mysite/templates/email then the Newsletter system will recognise this new .ss file and let you select it in the dropdown.
This currently goes against the convention of keeping templates inside themes/yourtheme/templates/email. If you want to keep you templates inside the themes/yourtheme/templates/email folder rather then the default mysite/template/email then you need to set this line in your mysite/_config file
// set email template folder to themes/mytemplate/templates/email
NewsletterAdmin::$template_paths = "themes/mytemplate/templates/email";