exit status 1 Error compiling for board Arduino/Genuino Uno

Using Arduino Programming Questions
1

Need help

#include <Servo.h>

Servo ser1;
int ser1Pin1 = 3;
int ser1Pin2 = 4;
int enablePin = 5;
int state;
int flag = 0;

void setup() {
pinMode(ser1Pin1, OUTPUT);
pinMode(ser1Pin2, OUTPUT);
pinMode(enablePin, OUTPUT);
digitalWrite(enablePin, HIGH);
Serial.begin(9600);
}

void loop() {
if (Serial.available() > 0) {
state = Serial.read();
flag = 0;
}
if (state == '0') {
digitalWrite(ser1Pin1, LOW);
digitalWrite(ser1Pin2, LOW);
if (flag == 0) {
Serial.println("Stop");
flag = 1;
}
else if (state == '1') {
digitalWrite(ser1Pin1, LOW);
digitalWrite(ser1Pin2, HIGH);
if (flag == 0) {
Serial.println("right");
flag = 1;
}
}
else if (state == '2') {
digitalWrite(ser1Pin1, HIGH);
digitalWrite(ser1Pin2, LOW);
if (flag == 0) {
Serial.println("left");
flag = 1;
}
}
}
}

2

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3

What is the exact error you have seen.