Code Errors while compiling

I want this code to be programmed in arduino uno but i am unable to do that can anyone please help me with this. Its quite urgent.

#include <LiquidCrystal.h>
#include <Servo.h>
String readString;

LiquidCrystal lcd( 12, 11, 5, 4, 3, 2);

Servo            SERVO ;
void setup()
{
Serial.begin(9600);
analogReference(EXTERNAL);
lcd.begin(16, 2);
SERVO.attach(10);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Initializing....");
lcd.setCursor(0,1);
lcd.print("Sensors..:).Wait.");
//SERVO.write(90);
// Serial.println("AT\r"); //To check if GSM module is working
delay(2000);
//SERVO.write(0);
//Serial.println("AT+CMGF=1\r");
//delay(1000);// set the SMS mode to text
//Serial.println("AT+CNMI=1,1,0,0,0\r");
delay(1000);
pinMode(6,OUTPUT);
pinMode(7,OUTPUT);
pinMode(8,OUTPUT);
pinMode(9,OUTPUT);
pinMode(13,INPUT);
}

void loop()
{
int TEMP_read = analogRead(0);
float temp = ((4.3 * TEMP_read * 100.0) / 1024);
//float temp = (TEMP_read/ 1024)*5000;
//float cel= temp/10;
lcd.clear();
lcd.setCursor(0,0);
lcd.print("TempC:");
lcd.println(temp);
//Serial.println(TEMP_read);
//Serial.println(cel);

int GAS_read = analogRead(1);
if(GAS_read >
= 300)
{
lcd.setCursor(0,1);
lcd.print("Gas Detected");
delay(1000);
}
if(GAS_read <= 300)
{
lcd.setCursor(0,1);
lcd.print("Gas Not Detected");
delay(1000);
}

int LDR_read = analogRead(2);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Light:");
lcd.print(LDR_read);
delay(1000);

if(digitalRead(13) ==  HIGH)
{
//lcd.clear();
lcd.setCursor(0,1);
lcd.print("Motion Detected");
//Serial.println("Motion Detected");
delay(1000);
}

while (Serial.available())
{

delay(3);
char c = Serial.read();
readString += c;
}
delay(1000);
if (readString.length() >
0)
{
if(readString.indexOf("LOAD1ON") >
=0)
{
LOAD1_ON();
readString = 0;
}

if(readString.indexOf("LOAD1OFF") >
=0)
{
LOAD1_OFF();
readString =0;
}
if(readString.indexOf("LOAD2ON") >
=0)
{
LOAD2_ON();
readString =0;
}
if(readString.indexOf("LOAD2OFF") >
=0)
{
LOAD2_OFF();
readString =0;
}
if(readString.indexOf("LOAD3ON") >
=0)
{
LOAD3_ON();
readString =0;
}
if(readString.indexOf("LOAD3OFF") >
=0)
{
LOAD3_OFF();
readString =0;
}
if(readString.indexOf("LOAD4ON") >
=0)
{
LOAD4_ON();
readString =0;
}
if(readString.indexOf("LOAD4OFF") >
=0)
{
LOAD4_OFF();
readString =0;
}
if(readString.indexOf("DOPEN") >
=0)
{
DOPEN();
readString =0;
}
if(readString.indexOf("DCLOSE") >
=0)
{
DCLOSE();
readString =0;
}
if(readString.indexOf("STATUS") >
=0)
{
TEMPERATURE();
GAS_Sensor();
PIR_Sensor();
LOADS_Status();

readString =0;
}
if(readString.indexOf("status") >
=0)
{
delay(1000);
Serial.println("AT+CMGS=\"9167433489\"\r");
delay(2000);
TEMPERATURE();
GAS_Sensor();
PIR_Sensor();
LOADS_Status();
delay(1000);
Serial.write(26);
delay(5000);
Serial.print("AT+CMGD=1");
Serial.println("\r");
delay(500);
readString =0;
}
if(readString.indexOf("+CMTI:") >
=0)
{
SMS_Read();

}
}
}



void LOAD1_ON()
{
digitalWrite(6,HIGH);
Serial.println("LOAD1=ON");

return;
}
void LOAD1_OFF()
{

digitalWrite(6,LOW);
Serial.println("LOAD1=OFF");
return;
}
void LOAD2_ON()
{
Serial.println("LOAD2=ON");
digitalWrite(7,HIGH);
return;
}
void LOAD2_OFF()
{

digitalWrite(7,LOW);
Serial.println("LOAD2=OFF");
return;
}
void LOAD3_ON()
{

digitalWrite(8,HIGH);
Serial.println("LOAD3=ON");
return;
}
void LOAD3_OFF()
{

digitalWrite(8,LOW);
Serial.println("LOAD3=OFF");
return;
}
void LOAD4_ON()
{

digitalWrite(9,HIGH);
Serial.println("LOAD4=ON");
return;
}
void LOAD4_OFF()
{

digitalWrite(9,LOW);
Serial.println("LOAD4=OFF");
return;
}
void DCLOSE()
{
Serial.println("DOOR Closed");
SERVO.write(90);
delay(500);
return;
}
void DOPEN()
{
Serial.println("Door open");
SERVO.write(0);
delay(500);
return;
}


void TEMPERATURE()
{
int TEMP_read = analogRead(0);
float temp = ((4.68 * TEMP_read * 100.0) / 1024);
Serial.print("TempC:");
Serial.println(temp);

delay(500);
return;
}

void GAS_Sensor()
{
int GAS_read = analogRead(1);

if(GAS_read >
= 300)
{
Serial.println("Gas Detected");
//lcd.setCursor(0,1);
//lcd.print("Gas Detected");
//delay(500);
}
if(GAS_read <= 300)
{
Serial.println("Gas Not Detected");
//lcd.setCursor(0,1);
//lcd.print("Gas Not Detected");
//delay(500);
}
delay(500);
return;

}

void PIR_Sensor()
{
if(digitalRead(13) ==  HIGH)
{
Serial.println("Motion Detected");
}
else
{
Serial.println("NO Motion");
}
return;
}


void LOADS_Status()
{
if(digitalRead(6) == HIGH)
{
Serial.print("Load1=ON");
}
else
{
Serial.println("Load1=OFF");
}
if(digitalRead(7) == HIGH)
{
Serial.print("Load2=ON");
}
else
{
Serial.println("Load2=OFF");
}
if(digitalRead(8) == HIGH)
{
Serial.print("Load3=ON");
}
else
{
Serial.println("Load3=OFF");
}
if(digitalRead(9) == HIGH)
{
Serial.print("Load4=ON");
}
else
{
Serial.print("Load4=OFF");
}
return;
}
void SMS_Read()
{
readString =0;
delay(500);
Serial.println("AT+CMGR=1\r");
delay(5000);
return;
}

Thank You.

Please zip and attach the code in future. You forgot to post what compilation error are you getting?