Error when compiling?

[Hummer75]

Arduino: 1.8.4 (Mac OS X), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, 115200, 4M (3M SPIFFS)"

Archiving built core (caching) in: /var/folders/zp/p1ptdlm96lb91f9xw7lgfmfm0000gn/T/arduino_cache_248173/core/core_esp8266_esp8266_nodemcuv2_CpuFrequency_80,UploadSpeed_115200,FlashSize_4M3M_a502e325cbed85a2c09cd9225de4a5c1.a sketch/sketch_oct04c.ino.cpp.o:(.text.setup+0x18): undefined reference to promisc_cb(unsigned char*, unsigned short)' sketch/sketch_oct04c.ino.cpp.o: In function setup': /Users/jimmylerche/Documents/Arduino/sketch_oct04c/sketch_oct04c.ino:46: undefined reference to print_client(clientinfo)' /Users/jimmylerche/Documents/Arduino/sketch_oct04c/sketch_oct04c.ino:46: undefined reference to print_beacon(beaconinfo)' /Users/jimmylerche/Documents/Arduino/sketch_oct04c/sketch_oct04c.ino:46: undefined reference to print_probe(probeinfo)' sketch/sketch_oct04c.ino.cpp.o: In function loop': /Users/jimmylerche/Documents/Arduino/sketch_oct04c/sketch_oct04c.ino:64: undefined reference to print_client(clientinfo)' /Users/jimmylerche/Documents/Arduino/sketch_oct04c/sketch_oct04c.ino:68: undefined reference to print_beacon(beaconinfo)' /Users/jimmylerche/Documents/Arduino/sketch_oct04c/sketch_oct04c.ino:69: undefined reference to `print_probe(probeinfo)' collect2: error: ld returned 1 exit status exit status 1 Error compiling for board NodeMCU 1.0 (ESP-12E Module).

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