MSP430 problem with flash memory using mspflash.h library

I have wrote an Energia program for MSP430G2553 and I want to save variable "counter" (an integer number from 0-255) in non-volatile memory using mspflash.h library in case of reset or power interrupt. But it doesn't saves it. Can anyone help, what is wrong with this part of my code?

#include "MspFlash.h"
#define flash SEGMENT_D

int pos=0;
int counter=0;
int p=0;

void loop() {

Flash.read(flash+(pos * sizeof(int)), (unsigned char*)&p, sizeof(int));

if (.............) {
counter=++counter;
} else {
counter=--counter;

}

Flash.erase(flash);

Flash.write(flash+(pos * sizeof(int)), (unsigned char*)&counter, sizeof(int));

}