Programming Node MCU on Mac

ZakAttack92 · February 4, 2020, 5:00am

Hello,

I am trying to program a node mcu on my mac using the arduino ide but I keep getting errors. Ive installed the usb to uart drivers, i can see the board in arduino ide but it wont compile.

Getting the following error :

Arduino: 1.6.11 (Mac OS X), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Legacy (new can return nullptr), All SSL ciphers (most compatible), 4MB (FS:2MB OTA:~1019KB), 2, v2 Lower Memory, Disabled, None, Only Sketch, 115200"

/Users/Landon/Desktop/Arduino.app/Contents/Java/arduino-builder -dump-prefs -logger=machine -hardware /Users/Landon/Desktop/Arduino.app/Contents/Java/hardware -hardware /Users/Landon/Library/Arduino15/packages -tools /Users/Landon/Desktop/Arduino.app/Contents/Java/tools-builder -tools /Users/Landon/Desktop/Arduino.app/Contents/Java/hardware/tools/avr -tools /Users/Landon/Library/Arduino15/packages -built-in-libraries /Users/Landon/Desktop/Arduino.app/Contents/Java/libraries -libraries /Users/Landon/Documents/Arduino/libraries -fqbn=esp8266:esp8266:nodemcuv2:xtal=80,vt=flash,exception=legacy,ssl=all,eesz=4M2M,led=2,ip=lm2f,dbg=Disabled,lvl=None____,wipe=none,baud=115200 -ide-version=10611 -build-path /var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/build461fff28b3e4c41b61326a2e006f9cdc.tmp -warnings=none -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.python3.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/python3/3.7.2-post1 -prefs=runtime.tools.mklittlefs.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/mklittlefs/2.5.0-4-69bd9e6 -prefs=runtime.tools.xtensa-lx106-elf-gcc.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506 -prefs=runtime.tools.mkspiffs.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/mkspiffs/2.5.0-4-b40a506 -verbose /Users/Landon/Downloads/Client_Canada_GreenHouse/Code/NodeMCU_DHT22_SoilSensor/NodeMCU_DHT22_SoilSensor.ino
failed MSpanList_Insert 0x310000 0x8a52500033 0x0
fatal error: MSpanList_Insert

runtime stack:
runtime.throw(0x2b050b)
	/usr/local/go/src/runtime/panic.go:491 +0xad fp=0x7ffeefbff130 sp=0x7ffeefbff100
runtime.MSpanList_Insert(0x2ce168, 0x310000)
	/usr/local/go/src/runtime/mheap.c:692 +0x8f fp=0x7ffeefbff158 sp=0x7ffeefbff130
MHeap_FreeSpanLocked(0x2cad60, 0x310000, 0x100)
	/usr/local/go/src/runtime/mheap.c:583 +0x163 fp=0x7ffeefbff198 sp=0x7ffeefbff158
MHeap_Grow(0x2cad60, 0x8, 0x0)
	/usr/local/go/src/runtime/mheap.c:420 +0x1a8 fp=0x7ffeefbff1d8 sp=0x7ffeefbff198
MHeap_AllocSpanLocked(0x2cad60, 0x1, 0x0)
	/usr/local/go/src/runtime/mheap.c:298 +0x365 fp=0x7ffeefbff218 sp=0x7ffeefbff1d8
mheap_alloc(0x2cad60, 0x1, 0x12, 0x0)
	/usr/local/go/src/runtime/mheap.c:190 +0x121 fp=0x7ffeefbff240 sp=0x7ffeefbff218
runtime.MHeap_Alloc(0x2cad60, 0x1, 0x10000000012, 0xf989)
	/usr/local/go/src/runtime/mheap.c:240 +0x66 fp=0x7ffeefbff278 sp=0x7ffeefbff240
MCentral_Grow(0x2d2ad8, 0x0)
	/usr/local/go/src/runtime/mcentral.c:197 +0x8b fp=0x7ffeefbff2e0 sp=0x7ffeefbff278
runtime.MCentral_CacheSpan(0x2d2ad8, 0x0)
	/usr/local/go/src/runtime/mcentral.c:85 +0x167 fp=0x7ffeefbff318 sp=0x7ffeefbff2e0
runtime.MCache_Refill(0x30c000, 0x12, 0x0)
	/usr/local/go/src/runtime/mcache.c:90 +0xa0 fp=0x7ffeefbff340 sp=0x7ffeefbff318
runtime.mcacheRefill_m()
	/usr/local/go/src/runtime/malloc.c:368 +0x57 fp=0x7ffeefbff360 sp=0x7ffeefbff340
runtime.onM(0x226eb0)
	/usr/local/go/src/runtime/asm_amd64.s:273 +0x9a fp=0x7ffeefbff368 sp=0x7ffeefbff360
runtime.mallocgc(0x120, 0x1c0720, 0x0, 0x0)
	/usr/local/go/src/runtime/malloc.go:178 +0x849 fp=0x7ffeefbff418 sp=0x7ffeefbff368
runtime.newobject(0x1c0720, 0x30c000)
	/usr/local/go/src/runtime/malloc.go:353 +0x49 fp=0x7ffeefbff440 sp=0x7ffeefbff418
runtime.newG(0x276ba)
	/usr/local/go/src/runtime/proc.go:233 +0x2a fp=0x7ffeefbff458 sp=0x7ffeefbff440
allocg(0x2bd660)
	/usr/local/go/src/runtime/proc.c:925 +0x1f fp=0x7ffeefbff468 sp=0x7ffeefbff458
runtime.malg(0x8000, 0x2bd700)
	/usr/local/go/src/runtime/proc.c:2106 +0x1f fp=0x7ffeefbff498 sp=0x7ffeefbff468
runtime.mpreinit(0x2bdac0)
	/usr/local/go/src/runtime/os_darwin.c:137 +0x27 fp=0x7ffeefbff4b0 sp=0x7ffeefbff498
mcommoninit(0x2bdac0)
	/usr/local/go/src/runtime/proc.c:201 +0xc9 fp=0x7ffeefbff4d8 sp=0x7ffeefbff4b0
runtime.schedinit()
	/usr/local/go/src/runtime/proc.c:138 +0x55 fp=0x7ffeefbff500 sp=0x7ffeefbff4d8
runtime.rt0_go(0x7ffeefbff538, 0x1d, 0x7ffeefbff538, 0x0, 0x0, 0x1d, 0x7ffeefbff738, 0x7ffeefbff778, 0x7ffeefbff784, 0x7ffeefbff794, ...)
	/usr/local/go/src/runtime/asm_amd64.s:95 +0x116 fp=0x7ffeefbff508 sp=0x7ffeefbff500
/Users/Landon/Desktop/Arduino.app/Contents/Java/arduino-builder returned 2

Error compiling for board NodeMCU 1.0 (ESP-12E Module).

Please advise, thank you

pert · February 4, 2020, 8:34am

You are encountering a bug that was fixed 2.5 years ago. Update your Arduino IDE and the problem will be solved:

ZakAttack92 · February 4, 2020, 2:20pm

Using the newly installed Arduino ide this is the error code I get:

Arduino: 1.8.11 (Mac OS X), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Legacy (new can return nullptr), All SSL ciphers (most compatible), 4MB (FS:2MB OTA:~1019KB), 2, v2 Lower Memory, Disabled, None, Only Sketch, 115200"

/private/var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/AppTranslocation/E2420260-9B5C-40F1-9631-6821CBC585B3/d/Arduino 3.app/Contents/Java/arduino-builder -dump-prefs -logger=machine -hardware /private/var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/AppTranslocation/E2420260-9B5C-40F1-9631-6821CBC585B3/d/Arduino 3.app/Contents/Java/hardware -hardware /Users/Landon/Library/Arduino15/packages -tools /private/var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/AppTranslocation/E2420260-9B5C-40F1-9631-6821CBC585B3/d/Arduino 3.app/Contents/Java/tools-builder -tools /private/var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/AppTranslocation/E2420260-9B5C-40F1-9631-6821CBC585B3/d/Arduino 3.app/Contents/Java/hardware/tools/avr -tools /Users/Landon/Library/Arduino15/packages -built-in-libraries /private/var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/AppTranslocation/E2420260-9B5C-40F1-9631-6821CBC585B3/d/Arduino 3.app/Contents/Java/libraries -libraries /Users/Landon/Documents/Arduino/libraries -fqbn=esp8266:esp8266:nodemcuv2:xtal=80,vt=flash,exception=legacy,ssl=all,eesz=4M2M,led=2,ip=lm2f,dbg=Disabled,lvl=None____,wipe=none,baud=115200 -vid-pid=0000_0000 -ide-version=10811 -build-path /var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/arduino_build_219138 -warnings=none -build-cache /var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/arduino_cache_305288 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.mklittlefs.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/mklittlefs/2.5.0-4-69bd9e6 -prefs=runtime.tools.mklittlefs-2.5.0-4-69bd9e6.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/mklittlefs/2.5.0-4-69bd9e6 -prefs=runtime.tools.xtensa-lx106-elf-gcc.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506 -prefs=runtime.tools.xtensa-lx106-elf-gcc-2.5.0-4-b40a506.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506 -prefs=runtime.tools.mkspiffs.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/mkspiffs/2.5.0-4-b40a506 -prefs=runtime.tools.mkspiffs-2.5.0-4-b40a506.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/mkspiffs/2.5.0-4-b40a506 -prefs=runtime.tools.python3.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/python3/3.7.2-post1 -prefs=runtime.tools.python3-3.7.2-post1.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/python3/3.7.2-post1 -verbose /Users/Landon/Documents/Arduino/sketch_feb03a/sketch_feb03a.ino
/private/var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/AppTranslocation/E2420260-9B5C-40F1-9631-6821CBC585B3/d/Arduino 3.app/Contents/Java/arduino-builder -compile -logger=machine -hardware /private/var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/AppTranslocation/E2420260-9B5C-40F1-9631-6821CBC585B3/d/Arduino 3.app/Contents/Java/hardware -hardware /Users/Landon/Library/Arduino15/packages -tools /private/var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/AppTranslocation/E2420260-9B5C-40F1-9631-6821CBC585B3/d/Arduino 3.app/Contents/Java/tools-builder -tools /private/var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/AppTranslocation/E2420260-9B5C-40F1-9631-6821CBC585B3/d/Arduino 3.app/Contents/Java/hardware/tools/avr -tools /Users/Landon/Library/Arduino15/packages -built-in-libraries /private/var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/AppTranslocation/E2420260-9B5C-40F1-9631-6821CBC585B3/d/Arduino 3.app/Contents/Java/libraries -libraries /Users/Landon/Documents/Arduino/libraries -fqbn=esp8266:esp8266:nodemcuv2:xtal=80,vt=flash,exception=legacy,ssl=all,eesz=4M2M,led=2,ip=lm2f,dbg=Disabled,lvl=None____,wipe=none,baud=115200 -vid-pid=0000_0000 -ide-version=10811 -build-path /var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/arduino_build_219138 -warnings=none -build-cache /var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/arduino_cache_305288 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.mklittlefs.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/mklittlefs/2.5.0-4-69bd9e6 -prefs=runtime.tools.mklittlefs-2.5.0-4-69bd9e6.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/mklittlefs/2.5.0-4-69bd9e6 -prefs=runtime.tools.xtensa-lx106-elf-gcc.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506 -prefs=runtime.tools.xtensa-lx106-elf-gcc-2.5.0-4-b40a506.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506 -prefs=runtime.tools.mkspiffs.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/mkspiffs/2.5.0-4-b40a506 -prefs=runtime.tools.mkspiffs-2.5.0-4-b40a506.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/mkspiffs/2.5.0-4-b40a506 -prefs=runtime.tools.python3.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/python3/3.7.2-post1 -prefs=runtime.tools.python3-3.7.2-post1.path=/Users/Landon/Library/Arduino15/packages/esp8266/tools/python3/3.7.2-post1 -verbose /Users/Landon/Documents/Arduino/sketch_feb03a/sketch_feb03a.ino
Using board 'nodemcuv2' from platform in folder: /Users/Landon/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3
Using core 'esp8266' from platform in folder: /Users/Landon/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3
Detecting libraries used...
/Users/Landon/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/xtensa-lx106-elf-g++ -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ -I/Users/Landon/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/sdk/include -I/Users/Landon/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/sdk/lwip2/include -I/Users/Landon/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/sdk/libc/xtensa-lx106-elf/include -I/var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/arduino_build_219138/core -c -w -Os -g -mlongcalls -mtext-section-literals -fno-rtti -falign-functions=4 -std=gnu++11 -ffunction-sections -fdata-sections -fno-exceptions -w -x c++ -E -CC -DNONOSDK22x_190703=1 -DF_CPU=80000000L -DLWIP_OPEN_SRC -DTCP_MSS=536 -DLWIP_FEATURES=1 -DLWIP_IPV6=0 -DARDUINO=10811 -DARDUINO_ESP8266_NODEMCU -DARDUINO_ARCH_ESP8266 "-DARDUINO_BOARD=\"ESP8266_NODEMCU\"" -DLED_BUILTIN=2 -DFLASHMODE_DIO -DESP8266 -I/Users/Landon/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/cores/esp8266 -I/Users/Landon/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/variants/nodemcu /var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/arduino_build_219138/sketch/sketch_feb03a.ino.cpp -o /dev/null
Generating function prototypes...
/Users/Landon/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/xtensa-lx106-elf-g++ -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ -I/Users/Landon/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/sdk/include -I/Users/Landon/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/sdk/lwip2/include -I/Users/Landon/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/sdk/libc/xtensa-lx106-elf/include -I/var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/arduino_build_219138/core -c -w -Os -g -mlongcalls -mtext-section-literals -fno-rtti -falign-functions=4 -std=gnu++11 -ffunction-sections -fdata-sections -fno-exceptions -w -x c++ -E -CC -DNONOSDK22x_190703=1 -DF_CPU=80000000L -DLWIP_OPEN_SRC -DTCP_MSS=536 -DLWIP_FEATURES=1 -DLWIP_IPV6=0 -DARDUINO=10811 -DARDUINO_ESP8266_NODEMCU -DARDUINO_ARCH_ESP8266 "-DARDUINO_BOARD=\"ESP8266_NODEMCU\"" -DLED_BUILTIN=2 -DFLASHMODE_DIO -DESP8266 -I/Users/Landon/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/cores/esp8266 -I/Users/Landon/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/variants/nodemcu /var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/arduino_build_219138/sketch/sketch_feb03a.ino.cpp -o /var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/arduino_build_219138/preproc/ctags_target_for_gcc_minus_e.cpp
"/private/var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/AppTranslocation/E2420260-9B5C-40F1-9631-6821CBC585B3/d/Arduino 3.app/Contents/Java/tools-builder/ctags/5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives /var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/arduino_build_219138/preproc/ctags_target_for_gcc_minus_e.cpp
Compiling sketch...

ZakAttack92 · February 4, 2020, 2:26pm

Compiling sketch...
/Users/Landon/Library/Arduino15/packages/esp8266/tools/python3/3.7.2-post1/python3 /Users/Landon/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/signing.py --mode header --publickey /Users/Landon/Documents/Arduino/sketch_feb03a/public.key --out /var/folders/02/183zpy314ll06v2krpwphqcw0000gn/T/arduino_build_219138/core/Updater_Signing.h
fork/exec /Users/Landon/Library/Arduino15/packages/esp8266/tools/python3/3.7.2-post1/python3: no such file or directory
Error compiling for board NodeMCU 1.0 (ESP-12E Module).
Invalid library found in /Users/Landon/Documents/Arduino/libraries/Arduino-master: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/Arduino-master
Invalid library found in /Users/Landon/Documents/Arduino/libraries/HX711-Load-Cell-Amplifier-master: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/HX711-Load-Cell-Amplifier-master
Invalid library found in /Users/Landon/Documents/Arduino/libraries/ArdunioMAVLink: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/ArdunioMAVLink
Invalid library found in /Users/Landon/Documents/Arduino/libraries/mavlink-master: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/mavlink-master
Invalid library found in /Users/Landon/Documents/Arduino/libraries/Arduino.app: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/Arduino.app
Invalid library found in /Users/Landon/Documents/Arduino/libraries/Arduino-master: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/Arduino-master
Invalid library found in /Users/Landon/Documents/Arduino/libraries/HX711-Load-Cell-Amplifier-master: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/HX711-Load-Cell-Amplifier-master
Invalid library found in /Users/Landon/Documents/Arduino/libraries/ArdunioMAVLink: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/ArdunioMAVLink
Invalid library found in /Users/Landon/Documents/Arduino/libraries/mavlink-master: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/mavlink-master
Invalid library found in /Users/Landon/Documents/Arduino/libraries/Arduino.app: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/Arduino.app
Invalid library found in /Users/Landon/Documents/Arduino/libraries/Arduino-master: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/Arduino-master
Invalid library found in /Users/Landon/Documents/Arduino/libraries/HX711-Load-Cell-Amplifier-master: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/HX711-Load-Cell-Amplifier-master
Invalid library found in /Users/Landon/Documents/Arduino/libraries/ArdunioMAVLink: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/ArdunioMAVLink
Invalid library found in /Users/Landon/Documents/Arduino/libraries/mavlink-master: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/mavlink-master
Invalid library found in /Users/Landon/Documents/Arduino/libraries/Arduino.app: no headers files (.h) found in /Users/Landon/Documents/Arduino/libraries/Arduino.app

pert · February 4, 2020, 2:38pm

The ESP8266 core for Arduino expects you to have Python 3 installed at /usr/local/bin/python3, but evidently it is not there on your system. You may have it at /usr/bin/python3 instead. If so, there is a workaround described here:

github.com/esp8266/Arduino

Error building on MacOS due to python3 not found

opened 12:36PM - 21 Dec 19 UTC

closed 02:53PM - 14 Jan 20 UTC

harveydobson

### Basic Infos - [x] This issue complies with the [issue POLICY doc](https:/…/github.com/esp8266/Arduino/blob/master/POLICY.md). - [x] I have read the documentation at [readthedocs](https://arduino-esp8266.readthedocs.io/en/latest) and the issue is not addressed there. - [x] I have tested that the issue is present in current master branch (aka latest git). - [x] I have searched the issue tracker for a similar issue. - [x] If there is a stack dump, I have decoded it. - [x] I have filled out all fields below. #### Platform - Hardware: [ESP8266-12e] - Core Version: [21/12/2019 12:10pm GMT] - Development Env: [Arduino IDE] - Operating System: [MacOS] ### Settings in IDE ![image](https://user-images.githubusercontent.com/8660605/71308028-bd19e180-23ee-11ea-9267-2b414dec3200.png) ### Problem Description Edit by @devyte: The problem seems to be that the build process doesn't find python3 on MacOS. Duplicate WiFi libs warning is unrelated. Original Problem Description follows. -------------------------------------------------------------------------------------------------------------------- When including the library and selecting the board, any code i use whether it is the wifi search or the code I was looking to use in my project, I get the following error: ``` Arduino: 1.8.10 (Mac OS X), Board: "NodeMCU 0.9 (ESP-12 Module), 80 MHz, Flash, Legacy (new can return nullptr), All SSL ciphers (most compatible), 4MB (FS:2MB OTA:~1019KB), v2 Lower Memory, Disabled, None, Only Sketch, 115200" Multiple libraries were found for "ESP8266WiFi.h" Used: /Users/xxxx/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/libraries/ESP8266WiFi fork/exec /Users/xxxx/Library/Arduino15/packages/esp8266/tools/python3/3.7.2-post1/python3: no such file or directory Error compiling for board NodeMCU 1.0 (ESP-12E Module). This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences. ``` If i remove the library it finds nothing. This is a new installation on my mac so there wouldn't be any conflicts. Not sure if anyone has experienced the same..? Seems likely unless i'm doing something very wrong, but looking at the current issue list I cannot see anything like this. Thanks ### [MCVE](https://stackoverflow.com/help/mcve) Sketch ```cpp /* This sketch demonstrates how to scan WiFi networks. The API is almost the same as with the WiFi Shield library, the most obvious difference bei›‹‹›ng the different file you need to include: */ #include "ESP8266WiFi.h" void setup() { Serial.begin(115200); // Set WiFi to station mode and disconnect from an AP if it was previously connected WiFi.mode(WIFI_STA); WiFi.disconnect(); delay(100); Serial.println("Setup done"); } void loop() { Serial.println("scan start"); // WiFi.scanNetworks will return the number of networks found int n = WiFi.scanNetworks(); Serial.println("scan done"); if (n == 0) { Serial.println("no networks found"); } else { Serial.print(n); Serial.println(" networks found"); for (int i = 0; i < n; ++i) { // Print SSID and RSSI for each network found Serial.print(i + 1); Serial.print(": "); Serial.print(WiFi.SSID(i)); Serial.print(" ("); Serial.print(WiFi.RSSI(i)); Serial.print(")"); Serial.println((WiFi.encryptionType(i) == ENC_TYPE_NONE) ? " " : "*"); delay(10); } } Serial.println(""); // Wait a bit before scanning again delay(5000); } ``` ### Debug Messages ``` Arduino: 1.8.10 (Mac OS X), Board: "NodeMCU 0.9 (ESP-12 Module), 80 MHz, Flash, Legacy (new can return nullptr), All SSL ciphers (most compatible), 4MB (FS:2MB OTA:~1019KB), v2 Lower Memory, Disabled, None, Only Sketch, 115200" Multiple libraries were found for "ESP8266WiFi.h" Used: /Users/xxxx/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/libraries/ESP8266WiFi fork/exec /Users/xxxx/Library/Arduino15/packages/esp8266/tools/python3/3.7.2-post1/python3: no such file or directory Error compiling for board NodeMCU 1.0 (ESP-12E Module). This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences. ```

If that doesn't work, maybe you don't have Python installed. You can install it using Brew.

This issue should be resolved in the next release of the ESP8266 core for Arduino.

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