When I try to add a product to the shopping cart, I receive the following error...

[KB]

When I try to add a product to the shopping cart, I receive the following error message: Error: sort trapped by operation mask at (eval 21) line 172.

Copy all the *.pm and *.pl files from 'Actinic v8\Original' into your 'Site1' folder (or whatever your site folder is called).

Then go to 'Web | Refresh Website.'

This should fix it.

This is now done automatically via 'Help | Troubleshooting' click on 'Purge and Refresh Web Site'.