can't run this code

I have installed both Adafruit_ssd1306-master and Adafruit-GFX-Library-master in the libraries folder.
but i can’t run the example code ssd1306_128X32_i2c.ino or ssd1306_128X64_i2c.ino, i keep getting the
following error, and i don’t know what it means, please help.

In file included from /Users/home/Documents/Arduino/libraries/Adafruit-GFX-Library-master/Adafruit_MonoOLED.cpp:21:0:
/Users/home/Documents/Arduino/libraries/Adafruit-GFX-Library-master/Adafruit_MonoOLED.h:30:10: fatal error: Adafruit_I2CDevice.h: No such file or directory
#include <Adafruit_I2CDevice.h>
^~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
exit status 1
Error compiling for board Arduino Uno.

As stated on GFX Library README:

You will also need to install the latest Adafruit BusIO library. Search for "Adafruit BusIO" in the library manager, or install by hand from GitHub - adafruit/Adafruit_BusIO: I2C, SPI and UART abstractions for use with Arduino

Thank you very much, I got it to work.