Debugging works for the whole project.
Can you perhaps share your project so we can look at what's happening there?
For starters, you shouldn't really include any source file (.c), only header files (.h).
If the compiler says the file does not exist, then the file does not exist. Maybe there's a typo in the file name. File names are also case-sensitive so if your file is called Manager.h and you try to #include "manager.h", then the compiler will not find the file.