The sketch is from
When I compile it for Generic ESP8266 Module, I got the above fatal error message.
The #include <SPIFFS.h> comes from file Configuration.hpp
When I compile it for ESP32 Dev Module, the #include <SPIFFS.h> works fine.
I have done searching for SPIFFS.h (in Windows) in my ..\AppData folder and found, that there is SPIFFS.h in my ...\packages\esp32\hardware...
but in corresponding ...\packages\esp8266\hardware... there is spiffs.h instead.
So I changed the
#include <SPIFFS.h>
to:
#if defined (ESP32)
#include <SPIFFS.h>
#else
#include <spiffs.h>
#endif
but I still get:
fatal error: spiffs.h: No such file or directory