Why " #include "std_lib_facilities.h" " showing error?

Question

I found this header in "Programming: principles and practices using C++"

Answer 1

This is not standard header file.
For offline compilers You need to download it and place it in header files library of your compiler.
I don't think it will work with any online compiler.

Answer 2

The file can be found on the author's website (but it can not be used on Sololearn, as Sololearn does not allow multiple files).