#include "MKL25Z4.h"
Servo myservo;
static int pos = 0;
void setup(){ myservo.attach(2) //PTA1 pin 2}
void loop(){ for (pos = 0; pos <= 180; pos += 1){ myservo.write(pos);}
for (pos = 180; pos >= 0; pos -= 1){ }}
Looks like you have simply imported an Arduino Servo sketch (incompletely copied from here?). It's missing more than a few pieces, including the #include "Servo.h" that would define the Servo class (which would be part of the Servo package). The FRDM is not an Arduino and the Arduiino development environment hides a lot of boilerplate code that you would have to supply to make this work. All is not lost, though -- try searching for FRDM-KL25Z arduino on Google and you'll find some useful resources to help. For example, Planet Arduino.