I downloaded Arduino code from this: https://github.com/BabyWrassler/MissionControl/ Github, and got the error message below.
It is designed to work with a Raspberry Pi, and I installed the two Adafruit libraries. I also have not hooked it up to either the Pi, or the two Adafruit devices, but that is partly because I cannot get it to run without the error message.
Update:
Here is what was highlighted:
Adafruit_LEDBackpack matrixA = Adafruit_LEDBackpack();
The orange bar says:
Variable or field ‘matrixOff‘ declared void
I cannot tell what of the following was from before, but here is the entire console log:
mcDesk.ino:2:53: error: Adafruit_LEDBackpack.h: No such file or directory
mcDesk.ino:3:45: error: Adafruit_GFX.h: No such file or directory
mcDesk:11: error: variable or field 'matrixOff' declared void
mcDesk:11: error: 'Adafruit_LEDBackpack' was not declared in this scope
mcDesk:11: error: expected primary-expression before 'buffer'
mcDesk:12: error: variable or field 'ledOn' declared void
mcDesk:12: error: 'Adafruit_LEDBackpack' was not declared in this scope
mcDesk:12: error: expected primary-expression before 'buffer'
mcDesk:12: error: expected primary-expression before 'cat'
mcDesk:12: error: expected primary-expression before 'an'
mcDesk:13: error: variable or field 'ledOff' declared void
mcDesk:13: error: 'Adafruit_LEDBackpack' was not declared in this scope
mcDesk:13: error: expected primary-expression before 'buffer'
mcDesk:13: error: expected primary-expression before 'cat'
mcDesk:13: error: expected primary-expression before 'an'
mcDesk:14: error: variable or field 'dispMat' declared void
mcDesk:14: error: 'Adafruit_LEDBackpack' was not declared in this scope
mcDesk:14: error: expected primary-expression before 'buffer'
mcDesk:17: error: variable or field 'threeDigitDisp' declared void
mcDesk:17: error: 'Adafruit_LEDBackpack' was not declared in this scope
mcDesk:17: error: expected primary-expression before 'buffer'
mcDesk:17: error: expected primary-expression before 'cats'
mcDesk:17: error: expected primary-expression before 'ans'
mcDesk:17: error: expected primary-expression before 'number'
mcDesk:18: error: variable or field 'digitDisp' declared void
mcDesk:18: error: 'Adafruit_LEDBackpack' was not declared in this scope
mcDesk:18: error: expected primary-expression before 'buffer'
mcDesk:18: error: expected primary-expression before 'pos'
mcDesk:18: error: expected primary-expression before 'cat'
mcDesk:18: error: expected primary-expression before 'an'
mcDesk:18: error: expected primary-expression before 'num'
mcDesk:23: error: variable or field 'switchBars' declared void
mcDesk:23: error: 'Adafruit_LEDBackpack' was not declared in this scope
mcDesk:23: error: expected primary-expression before 'buffer'
mcDesk:23: error: expected primary-expression before 'grphCats'
mcDesk:23: error: expected primary-expression before 'grphAns'
mcDesk:23: error: expected primary-expression before 'cmnd'
mcDesk:23: error: expected primary-expression before 'offset'
mcDesk:24: error: variable or field 'barDisp' declared void
mcDesk:24: error: 'Adafruit_LEDBackpack' was not declared in this scope
mcDesk:24: error: expected primary-expression before 'buffer'
mcDesk:24: error: expected primary-expression before 'grphCats'
mcDesk:24: error: expected primary-expression before 'grphAns'
mcDesk:24: error: expected primary-expression before 'pos'
mcDesk:24: error: expected primary-expression before 'offset'
mcDesk:25: error: variable or field 'cBarDisp' declared void
mcDesk:25: error: 'Adafruit_LEDBackpack' was not declared in this scope
mcDesk:25: error: expected primary-expression before 'buffer'
mcDesk:25: error: expected primary-expression before 'grphCats'
mcDesk:25: error: expected primary-expression before 'grphAns'
mcDesk:25: error: expected primary-expression before 'pos'
mcDesk:25: error: expected primary-expression before 'offset'
mcDesk:11: error: 'Adafruit_LEDBackpack' does not name a type
mcDesk:12: error: 'Adafruit_LEDBackpack' does not name a type
mcDesk:13: error: 'Adafruit_LEDBackpack' does not name a type
mcDesk:14: error: 'Adafruit_LEDBackpack' does not name a type
mcDesk:15: error: 'Adafruit_LEDBackpack' does not name a type
mcDesk.ino: In function 'void decodeCommand()':
mcDesk:193: error: 'matrixE' was not declared in this scope
mcDesk:193: error: 'ledOn' was not declared in this scope
mcDesk:199: error: 'matrixE' was not declared in this scope
mcDesk:199: error: 'ledOff' was not declared in this scope
mcDesk:204: error: 'matrixC' was not declared in this scope
mcDesk:204: error: 'cBarDisp' was not declared in this scope
mcDesk.ino: In function 'void allMatrixOff()':
mcDesk:213: error: 'matrixA' was not declared in this scope
mcDesk:213: error: 'matrixOff' was not declared in this scope
mcDesk:214: error: 'matrixB' was not declared in this scope
mcDesk:215: error: 'matrixC' was not declared in this scope
mcDesk:216: error: 'matrixD' was not declared in this scope
mcDesk:217: error: 'matrixE' was not declared in this scope
mcDesk.ino: At global scope:
mcDesk:220: error: variable or field 'matrixOff' declared void
mcDesk:220: error: 'Adafruit_LEDBackpack' was not declared in this scope
mcDesk:220: error: expected primary-expression before 'buffer'
Adafruit_LEDBackpack
not declared" tells me maybe the library wasn't installed? Can you run one of the examples in that library? (File > Examples)