*  Executing task in folder GPIO: C:\Users\OtisToshiba\.platformio\penv\Scripts\platformio.exe run 

Processing nodemcu (platform: espressif8266; board: nodemcu; framework: arduino)
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/espressif8266/nodemcu.html
PLATFORM: Espressif 8266 (4.2.1) > NodeMCU 0.9 (ESP-12 Module)
HARDWARE: ESP8266 80MHz, 80KB RAM, 4MB Flash
PACKAGES:
 - framework-arduinoespressif8266 @ 3.30102.0 (3.1.2)
 - tool-esptool @ 1.413.0 (4.13)
 - tool-esptoolpy @ 1.30000.201119 (3.0.0)
 - toolchain-xtensa @ 2.100300.220621 (10.3.0)
LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 38 compatible libraries
Scanning dependencies...
No dependencies
Building in release mode
Linking .pio\build\nodemcu\firmware.elf
c:/users/otistoshiba/.platformio/packages/toolchain-xtensa/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld.exe: .pio\build\nodemcu\src\main.cpp.o:(.text.setup+0x4): undefined reference to `_ZN8GPIO_Pin2OnEh'
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\nodemcu\firmware.elf] Error 1