Ce qui est le noyau.un (principale.rpc.o) erreur dans l'Arduino?

J'ai été compling mon code dans l'Arduino et tout à coup j'ai eu cette erreur:

 core.a(main.cpp.o): In function `main':
 D:\Personal\Arduino\arduino-1.0.4-windows\arduino-  1.0.4\hardware\arduino\cores\arduino/main.cpp:11: undefined reference to `setup'
 D:\Personal\Arduino\arduino-1.0.4-windows\arduino-1.0.4\hardware\arduino\cores\arduino/main.cpp:14: undefined reference to `loop'

Je n'ai aucune idée de ce que cela signifie. Voici mon code:

#ifndef dht_h
#define dht_h
#if ARDUINO < 100
#include <WProgram.h>
#else
#include <Arduino.h>
#endif
#define DHT_LIB_VERSION "0.1.05"
#define DHTLIB_OK                0
#define DHTLIB_ERROR_CHECKSUM   -1
#define DHTLIB_ERROR_TIMEOUT    -2
#define DHTLIB_INVALID_VALUE  -999
#include <dht.h>
#define TIMEOUT 10000
class dht
{
public:
int read22(uint8_t pin);
double humidity;
double temperature;
private:
uint8_t bits[5];  //Buffer to receive data
int read(uint8_t pin);
};
#endif
//return values:
//DHTLIB_OK
//DHTLIB_ERROR_CHECKSUM
//DHTLIB_ERROR_TIMEOUT
int dht::read22(uint8_t pin)
{
//READ VALUES
int rv = read(pin);
if (rv != DHTLIB_OK)
{
humidity    = DHTLIB_INVALID_VALUE;  //Invalid value, or is NaN prefered?
temperature = DHTLIB_INVALID_VALUE;  //Invalid value
return rv;
}
//CONVERT AND STORE
humidity    = word(bits[0], bits[1]) * 0.1;
if (bits[2] & 0x80) //negative temperature
{
temperature = word(bits[2]&0x7F, bits[3]) * 0.1;
temperature *= -1.0;
}
else
{
temperature = word(bits[2], bits[3]) * 0.1;
}
//TEST CHECKSUM
uint8_t sum = bits[0] + bits[1] + bits[2] + bits[3];
if (bits[4] != sum) return DHTLIB_ERROR_CHECKSUM;
return DHTLIB_OK;
}
//Private
//return values:
//DHTLIB_OK
//DHTLIB_ERROR_TIMEOUT
int dht::read(uint8_t pin)
{
//INIT BUFFERVAR TO RECEIVE DATA
uint8_t cnt = 7;
uint8_t idx = 0;
//EMPTY BUFFER
for (int i=0; i< 5; i++) bits[i] = 0;
//REQUEST SAMPLE
pinMode(pin, OUTPUT);
digitalWrite(pin, LOW);
delay(20);
digitalWrite(pin, HIGH);
delayMicroseconds(40);
pinMode(pin, INPUT);
//GET ACKNOWLEDGE or TIMEOUT
unsigned int loopCnt = TIMEOUT;
while(digitalRead(pin) == LOW)
if (loopCnt-- == 0) return DHTLIB_ERROR_TIMEOUT;
loopCnt = TIMEOUT;
while(digitalRead(pin) == HIGH)
if (loopCnt-- == 0) return DHTLIB_ERROR_TIMEOUT;
//READ THE OUTPUT - 40 BITS => 5 BYTES
for (int i=0; i<40; i++)
{
loopCnt = TIMEOUT;
while(digitalRead(pin) == LOW)
if (loopCnt-- == 0)
return DHTLIB_ERROR_TIMEOUT;
unsigned long t = micros();
loopCnt = TIMEOUT;
while(digitalRead(pin) == HIGH)
if (loopCnt-- == 0)
return DHTLIB_ERROR_TIMEOUT;
if ((micros() - t) > 40)
bits[idx] |= (1 << cnt);
if (cnt == 0) //Next byte?
{
cnt = 7;
idx++;
}
else
cnt--;
}
return DHTLIB_OK;
}

Que dois-je faire pour corriger ce code?