Compiling error win 10

Hi im a complete newbie to arduino and this is basiclly my first program but couldnt find a soulution online.

this is my code:
//Blinking led
int ledPin = 13;
int switchPin = 8;
boolean lastButton = LOW;
boolean ledOn = false;
boolean currentLEDStatus = LOW;

void setup()
// difines if pins are input/output
pinMode(switchPin, INPUT);
pinMode(ledPin, OUTPUT);
//stops the led button from bouncing

boolean debounce(boolean last)
boolean current = digitalRead(switchPin);
if (last != current)
current = digitalRead(switchPin);
return current;

void loop()
//runs the bouncing removing scrpit
currentLEDStatus = debounce(lastButton);
//checks if button is pressed and what the last input to the led was
if (lastButton == LOW && currentLEDStatus == HIGH)
ledOn = !ledOn;
lastButton = digitalRead(switchPin);
digitalWrite(ledPin, ledOn);

when i run it get this error:

C:\Users\Nils\AppData\Local\Temp\build5312520591207345653.tmp/core.a(wiring.c.o): In function delay': D:\programfiler\Arduino\hardware\arduino\avr\cores\arduino/wiring.c:114: undefined reference to yield'
collect2.exe: error: ld returned 1 exit status
Error compiling.

Btw my pc specs if it matters
intel i7 4810mq
gtx 880m with 8gb vram
16gb ram
1tb D: drive
128gb C: drive

please help i dont know what the heck is wrong so if somebody could reply that would be really helpful.

Something is screwed up in your IDE installation. Reinstall it. Make sure you have the latest.

Something is screwed up in your IDE installation. Reinstall it. Make sure you have the latest.

Currently the latest means 1.6.11. NOT 1.6.10!

Welcome to the Forum

Please read the first post in any forum entitled how to use this forum.,148850.0.html
then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.

Thanks.. Tom.... :slight_smile:
It compiled under 1.6.7.

Yeah - something unholy has happened to your avr boards core.

Uninstall, Delete C:\Users\Nils\AppData (hidden folder)\Local\Arduino15, reinstall 1.6.11