[Arduino] multiple definition of `__vector_7' 에러

Tone.cpp.o (symbol from plugin): In function `timer0_pin_port':
(.text+0x0): multiple definition of `__vector_7'
\arduino_build_600754\sketch\Scratch3Firmware.ino.cpp.o (symbol from plugin):(.text+0x0): first defined here
collect2.exe: error: ld returned 1 exit status
exit status 1

\libraries\NewTone\NewTone.cpp.o (symbol from plugin): In function `NewTone(unsigned char, unsigned long, unsigned long)':
(.text+0x0): multiple definition of `__vector_11'
\libraries\Servo\avr\Servo.cpp.o (symbol from plugin):(.text+0x0): first defined here
collect2.exe: error: ld returned 1 exit status
exit status 1

#include <TimerFreeTone.h>

#define TONE_PIN 6 // Pin you have speaker/piezo connected to (be sure to include a 100 ohm resistor).

// Melody (liberated from the toneMelody Arduino example sketch by Tom Igoe).
int melody[] = { 262, 196, 196, 220, 196, 0, 247, 262 };
int duration[] = { 250, 125, 125, 250, 250, 250, 250, 250 };

void setup() {}

void loop() {
  for (int thisNote = 0; thisNote < 8; thisNote++) { // Loop through the notes in the array.
    TimerFreeTone(TONE_PIN, melody[thisNote], duration[thisNote]); // Play melody[thisNote] for duration[thisNote].
    delay(50); // Short delay between notes.
  }
}