After updating ESP32 to core version 2.0.4 (file in Arduino IDE preferences was replaced tohttps://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json to upgrade), I get the following error:

/Users/guydvir/Dropbox/Arduino/libraries/LittleFS_esp32/src/LITTLEFS.cpp: In member function 'virtual bool LITTLEFSImpl::exists(const char*)':
/Users/guydvir/Dropbox/Arduino/libraries/LittleFS_esp32/src/LITTLEFS.cpp:44:28: error: no matching function for call to 'LITTLEFSImpl::open(const char*&, const char [2])'
     File f = open(path, "r");
In file included from /Users/guydvir/Dropbox/Arduino/libraries/LittleFS_esp32/src/LITTLEFS.cpp:17:
/Users/guydvir/Library/Arduino15/packages/esp32/hardware/esp32/2.0.4/libraries/FS/src/vfs_api.h:38:17: note: candidate: 'virtual fs::FileImplPtr VFSImpl::open(const char*, const char*, bool)'
     FileImplPtr open(const char* path, const char* mode, const bool create) override;

I minimized code to headers only ( and empty setup and loop:

#include "FS.h" //#include "LITTLEFS.h" // <----- commenting out stops the error message #include <time.h> #include <WiFi.h>

What may be the error and how to fix it ?

  • 1
    maybe uninstall the library. github.com/lorol/LITTLEFS#readme
    – Juraj
    Aug 29, 2022 at 9:06
  • @Juraj now after downgade back to 1.0.4 (still in new repository) it cant find $PATH for python.....
    – guyd
    Aug 29, 2022 at 9:41
  • @Juraj see pic below
    – guyd
    Aug 29, 2022 at 9:48
  • you have 2.0.4, not 1.0.4
    – Juraj
    Aug 29, 2022 at 10:02
  • @Juraj I'm trying to understand what have change between 1.0.4 to 2.0.4
    – guyd
    Aug 29, 2022 at 11:56

2 Answers 2


As you experienced, the Lorol's LittleFS_esp32 library was merged into ESP32 core from v1.0.6 and creates compile error to some old codes.

The difference is you have to use #include <LittleFS.h> instead of #include <LITTLEFS.h> for new cores (v1.0.6, v2.0.0+)

Check and modify the following snippet (used widely in my ESP_WiFiManager library ) for your purpose

// Check cores/esp32/esp_arduino_version.h and cores/esp32/core_version.h
  #if (_WIFIMGR_LOGLEVEL_ > 3)
    #warning Using ESP32 Core 1.0.6 or 2.0.0+
  // The library has been merged into esp32 core from release 1.0.6
  #include <LittleFS.h>       // https://github.com/espressif/arduino-esp32/tree/master/libraries/LittleFS
  FS* filesystem =      &LittleFS;
  #define FileFS        LittleFS
  #define FS_Name       "LittleFS"
  #if (_WIFIMGR_LOGLEVEL_ > 3)
    #warning Using ESP32 Core 1.0.5-. You must install LITTLEFS library
  // The library has been merged into esp32 core from release 1.0.6
  #include <LITTLEFS.h>       // https://github.com/lorol/LITTLEFS
  FS* filesystem =      &LITTLEFS;
  #define FileFS        LITTLEFS
  #define FS_Name       "LittleFS"

As Juraj commented - no need for LittleFS_esp32 library, after upgrade to esp32 Arduino 2.0.4

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