If that is literally the message then, when it comes to printing out the placeholders instead of the values, I am sure a lot of us have been there and done that . However I am somewhat surprised to see it make it to a live environment. Someone, somewhere, will be getting funny looks.
Also, (occurred at the same time as the %% notification first appeared), one of my ST outlets is now showing offline despite working correctly in automations and when operated from the home screen.
Edit: Hub reboot resolved the offline device issue