I NEED HELP :,( i has many error with lvgl and keil c

I start with lvgl by keil c at yesterday, but when i copy some file to my projectit has too many errors,
I don’t know where to start editing, these erorr are "Error: L6218E: Undefined symbol ".

I upload my project on GitHub - OWlchanMagican/ERROR_FILE: some erorr with keil c and lvgl