Servo

this program throws me error like this :
" Using library Servo at version 1.1.1 in folder: C:\Program Files (x86)\Arduino\libraries\Servo"
‘exit status 1’.
Do i have a library error or what ?

Here is the program :

"#include<Servo.h>
#include<PID_v1.h>
#include<NewPing.h>

#define TRIGGER_PIN 5 //Trigger Pin for UltraSonic Sensor
#define ECHO_PIN 6 //Echo Pin for UltraSonic Sensor
#define MAX_DISTANCE 30 //Max Distance to be sensed (cm)
const int servoPin = 9; //Servo Pin
int potPin = A0; //Analog Potentiometer Pin

float Kp = 0.8; //Initial Proportional Gain
float Ki = 0.07; //Initial Integral Gain
float Kd = 0.12; //Intitial Derivative Gain
double Setpoint, Input, Output;

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); //Initialize NewPing object, which is in the class
// NewPing that calcualtes and digitally filters
// Ultrasonic Sensor data

PID myPID(&Input, &Output, &Setpoint, Kp, Ki, Kd, DIRECT); //Initialize PID object, which is in the class PID.
// This class ‘filters’ the error signal based on
// where the Setpoint and Input is. The Output is
// sent to the Servo in terms of degrees.

Servo myServo; //Initial Servo.

void setup() {

Serial.begin(9600); //Begin Serial (to show readings)
myServo.attach(servoPin); //Attach Servo

Input = readPosition(); //Calls function readPosition() and sets the balls
// position as the input to the PID algorithm

Setpoint = map( analogRead(potPin), 0, 255, 5, 20); //Desired location of ball in terms of potentiometer redading
myPID.SetMode(AUTOMATIC); //Set PID object myPID to AUTOMATIC (see playground for more details)
myPID.SetOutputLimits(80, 100); //Set Output limits to 80 and 100 degrees. This keeps my servo from
// going too far each way and messing up the plant.
}

void loop()
{

Setpoint = map( analogRead(potPin), 0, 255, 5, 20); //Setpoint same as above in function setup() (see above for more details)
Input = readPosition(); //Input same as above in function setup() (see above for more details)
myPID.Compute(); //The ‘magic’ happens and algorithm computes Output in range of 80 to 100 degrees
myServo.write(Output); //Writes value of Output to servo

printData(Setpoint, Input, Output); //Calls function printData(). Prints Setpoint, Input, and Output to Serial
newGains(); //Calls function newGains(). Changes Kp, Ki, and Kd and prints to Serial
}

//**********************************************************************************************************************************************************
//PrintData() prints Setpoint, Input, and Output to Serial each time PID loop runs. This may cause PID loop to run a tad slower than wanted
// so it may be helpful to use this only when testing
//**********************************************************************************************************************************************************
void printData(float set, float in, float out) {
Serial.print(“Setpoint = “);
Serial.print(set);
Serial.print(” Input = “);
Serial.print(in);
Serial.print(” Output = “);
Serial.print(out);
Serial.print(”\n”);
}

//**********************************************************************************************************************************************************
//newGains() watis to see if anything is typed in serial port. If there is, the values are put into Kp, Ki, and Kd. Then the values are printed to Serial.
//**********************************************************************************************************************************************************
void newGains() {
if (Serial.available() > 0) { //If there is any data in serial input, then it starts reading.
delay(100); //Pause for a tenth of a second to readjust plant or anything else you need to do.
// Can be as long as needed.
for (int i = 0; i < 4; i = i + 1) {
switch (i) {
case 0: //Reads 1st value in
Kp = Serial.parseFloat();
break;
case 1: //Reads 2st value in
Ki = Serial.parseFloat();
break;
case 2: //Reads 3st value in
Kd = Serial.parseFloat();
break;
case 3: //Clears any remaining parts.
for (int j = Serial.available(); j == 0; j = j - 1) {
Serial.read();
}
break;
}
}
Serial.print(" Kp, Ki, Kd = “); //Prints new gain values to Serial
Serial.print(Kp);
Serial.print(”, “);
Serial.print(Ki);
Serial.print(”, ");
Serial.println(Kd);
myPID.SetTunings(Kp, Ki, Kd);
}

}

//**********************************************************************************************************************************************************
//readPosition() reads the position of the ball and returns balls position in cm.
//**********************************************************************************************************************************************************

float readPosition() {
delay(36); //Don’t set too low or echos will run into eachother.
unsigned int uS = sonar.ping_median(4); //ping_median() function is in class NewPing. It is a digital filter that takes the
// the average of 4 (in this case) pings and returns that distance value. This helps
// to filter out the pesy noise in those $5.00 UltraSonic Sensors. You know which
// ones I am talking about…
return uS / US_ROUNDTRIP_CM; //Returns distance value.
}

"

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 for (int j = Serial.available(); j == 0; j = j - 1) { 
             Serial.read();  
           }

Unusual construct.

for (int j = Serial.available(); j == 0; j = j - 1)

Starting with j equal to the number of variables, while j is 0, read a value from the serial port, and decrement j. What are the chances that that code will ever successfully read anything?