Hi,
That is related with the WordPress update to the 4.5 version.
You should update to the latest Cardinal versio, it was suppose to appear a notice to update in Appearance-> themes but guess something in your server is blocking it.
Use this version to replace all the theme files, if you made any customizations in the themes you should backup it and move it to a child theme.
https://www.dropbox.com/s/ayttwf3rty1xhd1/cardinal.zip?dl=0
Some documentation about a manual update
http://www.swiftideas.com/knowledgebase/how-to-manually-update-your-theme/
Let us know if it worked.
-Rui