Compile error: 'handleMessage' was not declared in this scope.? Answered
I downloaded the sketch directly from the class page, no modifications other than my user info. In addition to this error message, I've noticed that the "#include AdafruitIO.h" is the only "#include" whose target (AdafruitIO.h) is not orange- it is still black. The other includes are orange. I looked at my libraries and did see that file there in the folder C:\Program Files (x86)\Arduino\libraries\Adafruit_IO_Arduino .