Thanks for writing in!
I checked and can see you have older version of the theme and cornerstone.
Kindly update it to the latest version. The latest version numbers as of this time are.
X 6.4.6, Cornerstone 3.4.6
Please review our update guide.
Remember to clear all caches when updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.