Firebeettle DFR0478 ESP issue in Arduino IDE

Hi everybody,

I have a firebeettle DF0478 bought in 2021.

Version of the board is v4

6 months ago, i made a sketch in Arduino IDE 1.8. This sketch was using “LittleFS.h” library. This library is part of ESP core, so no need to add the library from the library manager. I had no issues to compile and download this sketch, and littleFS files on the 16Mo flash where fonctionnal.

Today, i try to recompile same sketch and i have an error regarding the littlefs library source code which is not found “no such file or directory”

I try in ide 1.8.x with various board profiles , either the one provided by DFRobot in wiki page https://downloadcd.dfrobot.com.cn/boards/package_DFRobot_index.json or the one available in ESP Arduino.

Any help is welcome