LoRa 32 V2 + Helium Gateway

I’m running into this problem when I run the code although no fault in the code.

  1. collect2: error: ld returned 1 exit status *** [.pio/build/heltec_wifi_lora_32_V2/firmware.elf] Error 1
    Does anyone know the solution to this issue?
    Also, I’m not able to connect to the Helium gateway!