IDE refuses to compile OLED ssd1306 128x64 for any of my boards but is still happy to compile for everything else. Have tried replacing and using SPI instead of i2c with no effect. On You Tube it works happily for everyone else.
The problem is in line 123456789 of your sketch 
Post your code.
Post the full error messsge (everything in orange in the output window).
In both cases, use code tags (as described in one of the stickies).