sonoff/user_config.h:72:1: error: expected unqualified-id before ‘\x20202020’
Well, I’ll just pop my telepathic problem-solving hat on… 
I’m guessing from that path you’re doing something with the Tasmota firmware?
Compiling for what board (i.e. particular one from project stock platformio.ini or a custom entry - specify if so)?
Have you made any changes to the code?
What operating system?
VSCode + PlatformIO? Atom + PlatformIO? Other (please specify)?