BLYNK_WRITE not triggering

Solved
1

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I am using WEMOS D1 R1.
Have been trying for hours but nothing works.

#define BLYNK_PRINT Serial

#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

char auth[] = "2cafade5c1224e2d8232af56667925ed";

char ssid[] = "Asif PTCL";
char pass[] = "asif1914";

void setup()
{
  // Debug console
  Serial.begin(9600);

  Blynk.begin(auth, ssid, pass);
}

void loop()
{
  Blynk.run();
}

BLYNK_WRITE(v0)
{
  int up = param.asInt();
  Blynk.virtualWrite(V4, 1);
}

BLYNK_WRITE(v1)
{
  int down = param.asInt();
  Blynk.virtualWrite(V4, 2);
}

BLYNK_WRITE(v2)
{
  int turnLeft = param.asInt();
  Blynk.virtualWrite(V4, 3);
}

BLYNK_WRITE(v3)
{
  int turnRight = param.asInt();
  Blynk.virtualWrite(V4, 4);
}
2

we need details to help you.
what do you mean by nothing works?
what is V4 ?
what do you see on the serial monitor?

3

I just checked and I had the ‘v’ in small instead of capital.
Thank you for trying to help.