I’ve looked for questions about this error here in the community and found this topic. But that topic is about BattleTank project and I had error with “Bulls and Cows”, and any solutions from there did not help me.
I’ve found the problem just intuitively. The reason was that I’ve renamed the directory with the project. And when I restored the initial name the problem had gone.
Thanks for posting. This helped me solve my issue where I had renamed my project folder to 02_BullCowGame-starter-kit. The 02_ then ends up in a bunch of #defines in the *.generated.h files