Can't add Page Attributes

Permalink
I cant seem to add a page attribute, every time I try I get an error message saying 'Attribute handles may only contain letters, numbers and underscore "_" characters'
I think i'm entering the correct information, see image attached.

Im running concrete5 version 5.6.1.2.

What am I doing wrong?

1 Attachment

 
ConcreteOwl replied on at Permalink Best Answer Reply
ConcreteOwl
remove the apostrophes
use page_thumbnail
NOT 'page_thumbnail'