'i2cWrite' and 'i2cRead' was not declared in this scope

This is the 3 line error in the code so how to fix it ?
while(i2cWrite(0x19,i2cData,4,false));
while(i2cWrite(0x6B,0x01,true));
while(i2cRead(0x75,i2cData,1));

#include <Kalman.h>
#include<Servo.h>
#include<Wire.h>
#include<I2Cdev.h>
#include<MPU6050.h>
MPU6050 CBgoc;
Kalman kalmanX;
//IMU 6050====================================================
int16_t accX, accY, accZ;
int16_t tempRaw;
int16_t gyroX, gyroY, gyroZ;
float accXangle;
float gyroXangel;
float kalAngelX;
unsigned long timer;
uint8_t i2cData[14];
float CurrentAngle;
// MOTOR====================================================
int AIN1 = 4;
int AIN2 = 5;
int BIN1 = 6;
int BIN2 = 7;
int CIN1 = 9;
int CIN2 = 10;
int speed;
// PID====================================================
const float Kp = 30;
const float Ki = 1;
const float Kd = 8;
float pTerm, iTerm, dTerm, integrated_error, last_error, error;
const float K = 1.9*1.12;
#define   GUARD_GAIN   10.0
#define runEvery(t) for (static typeof(t) _lasttime;(typeof(t))((typeof(t))millis() - _lasttime) > (t);_lasttime += (t))

void setup() 
{
pinMode(AIN1, OUTPUT); 
pinMode(AIN2, OUTPUT);
pinMode(BIN1, OUTPUT);
pinMode(BIN2, OUTPUT);
Serial.begin(9600);
Wire.begin();

i2cData[0] = 7; // Set the sample rate to 1000Hz - 8kHz/(7+1) = 1000Hz 
i2cData[1] = 0x00; // Disable FSYNC and set 260 Hz Acc filtering, 256 Hz Gyro filtering, 8 KHz sampling 
i2cData[2] = 0x00;
i2cData[3] = 0x00;
while(i2cWrite(0x19,i2cData,4,false)); 
while(i2cWrite(0x6B,0x01,true));
while(i2cRead(0x75,i2cData,1));
if(i2cData[0] != 0x68) { // Read "WHO_AM_I" register
Serial.print(F("Error reading sensor"));
while(1);
}
delay(100); 

//Kalman====================================================
while(i2cRead(0x3B,i2cData,6));
accX = ((i2cData[0] << 8) | i2cData[1]);
accY = ((i2cData[2] << 8) | i2cData[3]);
accZ = ((i2cData[4] << 8) | i2cData[5]);
accXangle = (atan2(accY,accZ)+PI)*RAD_TO_DEG;
kalmanX.setAngle(accXangle); 
gyroXangel = accXangle; 
timer = micros();
}

void loop()
{
Serial.println(accX);
// Serial.println(accY);
// Serial.println(accZ);
Serial.println(accXangle);
Serial.println(CurrentAngle);
runEvery(25)
{
dof();
if(CurrentAngle <=179 && CurrentAngle >=178.5)
{
stop();
}
else
{
if(CurrentAngle < 230 && CurrentAngle >130)
  {
Pid();
Motors();
  }
else
  {
stop();
  }
}
} 
}
void Motors()
{
if(speed > 0)
{
analogWrite(CIN1, speed);
digitalWrite(AIN1, LOW);
digitalWrite(AIN2, HIGH);
analogWrite(CIN2, speed);
digitalWrite(BIN1, LOW);
digitalWrite(BIN2, HIGH);
}
else
{
speed = map(speed,0,-255,0,255);
analogWrite(CIN1, speed);
digitalWrite(AIN1, HIGH);
digitalWrite(AIN2, LOW);
analogWrite(CIN2, speed);
digitalWrite(BIN1, HIGH);
digitalWrite(BIN2, LOW);
}
}
void stop()
{
speed = map(speed,0,-150,0,150);
analogWrite(CIN1, speed);
digitalWrite(AIN1, LOW);
digitalWrite(AIN2, HIGH);
analogWrite(CIN2, speed);
digitalWrite(BIN1, LOW);
digitalWrite(BIN2, HIGH);
}
void Pid()
{
error = 180 - CurrentAngle;  // 180 = level
pTerm = Kp * error;
integrated_error += error;
iTerm = Ki*constrain(integrated_error, -GUARD_GAIN, GUARD_GAIN);
dTerm = Kd*(error - last_error);
last_error = error;
speed = constrain(K*(pTerm + iTerm + dTerm), -255, 255);
}
void dof()
{
while(i2cRead(0x3B,i2cData,14));
accX = ((i2cData[0] << 8) | i2cData[1]);
accY = ((i2cData[2] << 8) | i2cData[3]);
accZ = ((i2cData[4] << 8) | i2cData[5]);
tempRaw = ((i2cData[6] << 8) | i2cData[7]);  
gyroX = ((i2cData[8] << 8) | i2cData[9]);
gyroY = ((i2cData[10] << 8) | i2cData[11]);
gyroZ = ((i2cData[12] << 8) | i2cData[13]);
accXangle = (atan2(accY,accZ)+PI)*RAD_TO_DEG;
double gyroXrate = (double)gyroX/131.0;
CurrentAngle = kalmanX.getAngle(accXangle, gyroXrate, (double)(micros()-timer)/1000000);
timer = micros();
}

Error

sketch_feb23a.ino: In function 'void setup()':
sketch_feb23a:51: error: 'i2cWrite' was not declared in this scope
sketch_feb23a:52: error: 'i2cWrite' was not declared in this scope
sketch_feb23a:53: error: 'i2cRead' was not declared in this scope
sketch_feb23a:61: error: 'i2cRead' was not declared in this scope
sketch_feb23a.ino: In function 'void dof()':
sketch_feb23a:143: error: 'i2cRead' was not declared in this scope

No, I can't see them either.

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