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C:\Users\Marc\AppData\Local\Temp\arduino_build_235898\libraries\MyControllerDevice\MyController.cpp.o: In function `checkFactoryResetPin()':
c:\users\marc\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9-2\xtensa-lx106-elf\include\c++\4.8.2/functional:2069: multiple definition of `timer'
C:\Users\Marc\AppData\Local\Temp\arduino_build_235898\sketch\RelayActuatorAndTemperature.ino.cpp.o:(.bss.timer+0x0): first defined here
collect2.exe: error: ld returned 1 exit status