I did the School Of Motion, Advanced Motion Methods course, and Sander Van Dijk uses an expression in it where you can change the frame in a comp shown by using an expression on the time re-map which reacts to the comp name. This is really handy for versioning and localising projects.
For example, if you changed the title from 'DE' to 'UK' it would change it from German to English.
When I first inputted the expression, it worked, however when I change the comp name to change the title, I get the error notification in the image. I hope this makes sense, let me know if it doesn't, and thanks in advance!
(btw, the course has now finished hence why I can't get any of their support.)