Erasing a flash sector for STM32G474RE is not working

Question

I am trying to design a UART bootloader for STM32G474RE microcontroller. I am having problem in Flash erasing part of the code. Before designing bootloader for STM32G474RE microcontroller, I tried for STM32F767Zi Nucleo kit. and it is working fine on that kit. The code for the Nucleo kit is as follows:

if( is_first_block ) {

  printf("Erasing the Flash memory...\r\n");
  //Erase the Flash
  FLASH_EraseInitTypeDef EraseInitStruct;
  uint32_t SectorError;

  EraseInitStruct.TypeErase     = FLASH_TYPEERASE_SECTORS;
  EraseInitStruct.Sector        = FLASH_SECTOR_5;
  EraseInitStruct.NbSectors     = 2;                    //erase 2 sectors(5,6)
  EraseInitStruct.VoltageRange  = FLASH_VOLTAGE_RANGE_3;

  ret = HAL_FLASHEx_Erase( &EraseInitStruct, &SectorError );
  if( ret != HAL_OK )
  {
    break;
  }
}

Here I am erasing 2 sectors.

Now when I am trying for STM32G474RE, I am having following issues:

1. There is no option to erase sectors (Only pages)
2. EraseInitStruct.VoltageRange = FLASH_VOLTAGE_RANGE_3; this command is giving error when I compile the code. ( I have checked stm32g4xx_hal_flash.h file but there is no information about it whereas stm32f7xx_hal_flash.h file has information about it.

It would be great if some could help me and guide me about these issue from their experience. I have attached photo of the error. Please have a look.