A bit of Googling your command GPIO.setmode(GPIO.BOARD) seems to indicate that it is python related, not javascript or WiringPi?.. Unfortunately I don’t have the knowledge in any of those to assist, and it appears js/Blynk is in holding pattern and py/Blynk is still beta.
In fact, I’m still trying to determine the validity of pursuing RPi/Blynk interfacing on a client level myself as I suspect ESP is the hardware focus.
While not the answer you may be looking for… pershap look at changing your hardware for your learning process and better forum assistance… we (the forum) know Blynk/ESP8266 very well 