C:\Users\Sarah\Documents\Arduino\harfatal error: SerialFlash.h: No such file or directory 33 | #include <SerialFlash.h> // github.com/PaulStoffregen/SerialFlash/blob/master/SerialFlash.h

[Imutchy]

Trying to build a wedding guest book as per playful technology.
Teensy 4.0
When I add the code it comes up with the fatal error.
C:\Users\Sarah\Documents\Arduino\hardware\teensy\avr\libraries\Audio/play_serialflash_raw.h:33:10: fatal error: SerialFlash.h: No such file or directory

33 | #include <SerialFlash.h> // github.com/PaulStoffregen/SerialFlash/blob/master/SerialFlash.h

I have no coding experience and have told my future bride that I can build this thing and now I only have 2 weeks to go and am panicking. Not because of the wedding or the vows but because of my first failure as a husband.
Any help appreciated. Thank you.