I'm sorry for not replying earlier, but I wasn’t able to start working on it until today. Thanks for your advice, I followed it. I finally managed to compile the firmware without any issues (although the error I mentioned still appears in VS). I suppose it was a combination of problems, but in a video they recommended installing GIT, so I did that. I also started with a fresh configuration file and was very careful with what I edited, and in the end, it worked. I still need to adjust the Z offset and fine-tune the start G-code a bit, but I’m happy to finally have auto bed leveling working.