My esp01 code keeps on erasing after reboot

Question

I am uploading a simple Blynk cloud example code to control a led on GPIO2 of my esp01 board.

#define BLYNK_TEMPLATE_ID ""
#define BLYNK_DEVICE_NAME ""
#define BLYNK_FIRMWARE_VERSION        "0.1.0"
#define BLYNK_PRINT Serial
//#define BLYNK_DEBUG
#define APP_DEBUG
// Uncomment your board, or configure a custom board in Settings.h
//#define USE_SPARKFUN_BLYNK_BOARD
//#define USE_NODE_MCU_BOARD
//#define USE_WITTY_CLOUD_BOARD
//#define USE_WEMOS_D1_MINI
#include "BlynkEdgent.h"
BLYNK_WRITE(V0)
{
 int pinValue = param.asInt();
  Serial.println("Value Change");
  digitalWrite(2,pinValue); 
}
void setup()
{
  pinMode(2,OUTPUT);
  Serial.begin(115200);
  delay(100);
BlynkEdgent.begin();
}
void loop() {
  BlynkEdgent.run();
}

when I run it for the first time it works flawlessly, it gets configured easily with Blynk app and i am able to control the led. but, when I reboot my esp01 it does not store the credentials and again starts the code from beginning!! I think I am not able to get out of programming mode. Please help me out !! Thanks