after downloading the ssd1306 master library and fixing the height error
(found here SSD1306 says Height incorrect - Displays - Arduino Forum)
I tried to download the program to my Arduino and got the error message "include adafruit_gfx.h". after downloading that code and adding it to the library, I was met with the error "include gfxfont.h", so i downloaded that code and added it to the library as well.
now when I try to download the code to my Arduino I get what you see in the attached picture.
I am new to this but is seems the problem is in the adafruit_gfx.h code. All the undefined references (setTextcolor, height() const, etc.) seem to come from there
(for reference: Adafruit-GFX-Library/Adafruit_GFX.h at master · adafruit/Adafruit-GFX-Library · GitHub)
please advise, thanks.