function not declared in the scope

Projects Programming
3 
void setup(){
Serial.begin(115200);
cli();
  TCCR1A=0;
  TCCR1B=0;
  TCNT=0;
  OCR1A=60;
  TCCR1B|=(1<<WGM12);
  TCCR1B|=(1<<CS12)|(1<<CS0);
  TIMSK1|=(1<<OCIEA);
sei();
 }
ISR(TIMER1_COMPA_vect)
{
intval=0;
Serial.write("A");
val=map(analogRead(A0),0,1024,0,255);Serial.write(val);
val=map(analogRead(A1),0,1024,0,255);Serial.write(val);
val=map(analogRead(A2),0,1024,0,255);Serial.write(val);
val=map(analogRead(A3),0,1024,0,255);Serial.write(val);
Serial.write("z");
}
void loop() 
{
  // put your main code here, to run repeatedly:
}