non working oled screens

gistfile1.ino

#include <Arduino.h>
#include <U8g2lib.h>

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

U8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

void setup(void) {
  u8g2.begin();// Oled display begins
}

void loop(void) {
  u8g2.clearBuffer();          // clear the internal memory
  u8g2.setFont(u8g2_font_inr38_mf); // choose a suitable font
  u8g2.drawStr(0,60,"taco");  // write something to the internal memory
  u8g2.sendBuffer();          // transfer internal memory to the display
  delay(1000);  
}