A few errors while compiling a program

This program is not finished, I am in the habit of compiling after every few steps to catch issues early.

//PID Libraries
#include <PID_v1.h>
#include <PID_AutoTune_v0.h>

//DS18B20 Libraries
#include <OneWire.h>
#include <DallasTemperature.h>

//BLynk Libraries
#define BLYNK_PRINT Serial    // Comment this out to disable prints and save space
#include <ESP8266_Lib.h>
#include <BlynkSimpleShieldEsp8266.h>

// So we can save and retrieve settings
#include <EEPROM.h>
// ************************************************
// Pin definitions
// ************************************************
// Output Relay
#define RelayPin 7
// One-Wire Temperature Sensor
// (Use GPIO pins for power/ground to simplify the wiring)
#define ONE_WIRE_BUS 2
#define ONE_WIRE_PWR 3
#define ONE_WIRE_GND 4

// ************************************************
// PID Variables and constants
// ************************************************
//Define Variables we'll be connecting to
double Setpoint;
double Input;
double Output;
volatile long onTime = 0;
// pid tuning parameters
double Kp;
double Ki;
double Kd;
// EEPROM addresses for persisted data
const int SpAddress = 0;
const int KpAddress = 8;
const int KiAddress = 16;
const int KdAddress = 24;
//Specify the links and initial tuning parameters
PID myPID(&Input, &Output, &Setpoint, Kp, Ki, Kd, DIRECT);

// 10 second Time Proportional Output window
int WindowSize = 10000; 
unsigned long windowStartTime;

// ************************************************
// States for state machine
// ************************************************
enum operatingState { OFF = 0, SETP, RUN, TUNE_P, TUNE_I, TUNE_D, AUTO};
operatingState opState = OFF;
// ************************************************
// Sensor Variables and constants
// ************************************************

// Data wire is plugged into port 2 on the Arduino
// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature. 
DallasTemperature sensors(&oneWire);
// arrays to hold device address
DeviceAddress tempSensor;

void LoadParameters();
void DriveOutput();

void setup() 
  // put your setup code here, to run once:

   // Initialize Relay Control:
   pinMode(RelayPin, OUTPUT);    // Output mode to drive relay
   digitalWrite(RelayPin, LOW);  // make sure it is off to start
   // Set up Ground & Power for the sensor from GPIO pins
   digitalWrite(ONE_WIRE_GND, LOW);
   digitalWrite(ONE_WIRE_PWR, HIGH);

// Start up the DS18B20 One Wire Temperature Sensor
   if (!sensors.getAddress(tempSensor, 0)) 
   sensors.setResolution(tempSensor, 12);
   // Initialize the PID and related variables
   myPID.SetOutputLimits(0, WindowSize);
  // Run timer2 interrupt every 15 ms 
  TCCR2A = 0;
  TCCR2B = 1<<CS22 | 1<<CS21 | 1<<CS20;
  //Timer2 Overflow Interrupt Enable
  TIMSK2 |= 1<<TOIE2;
// ************************************************
// Timer Interrupt Handler
// ************************************************
  if (opState == OFF)
    digitalWrite(RelayPin, LOW);  // make sure relay is off

void loop() {
  // put your main code here, to run repeatedly:


This is my current code. Earlier today, I did not have

void LoadParameters();
void DriveOutput();

This led to errors because loadparameters() and DriveOutput() were not defined.

after adding that code in above the void setup(), I am still getting these errors that I do not really understand.

In file included from C:\Users\-_-\Documents\Arduino\Projects\sketch_feb24a\sketch_feb24a.ino:3:0:

C:\Users\-_-\Documents\Arduino\libraries\PID_AutoTune_v0/PID_AutoTune_v0.h:3:0: warning: "LIBRARY_VERSION" redefined

 #define LIBRARY_VERSION 0.0.1


In file included from C:\Users\-_-\Documents\Arduino\Projects\sketch_feb24a\sketch_feb24a.ino:2:0:

C:\Users\-_-\Documents\Arduino\libraries\PID/PID_v1.h:3:0: note: this is the location of the previous definition

 #define LIBRARY_VERSION 1.1.1


C:\Users\-_-\AppData\Local\Temp\ccAgg2oe.ltrans0.ltrans.o: In function `setup':

C:\Users\-_-\Documents\Arduino\Projects\sketch_feb24a/sketch_feb24a.ino:112: undefined reference to `LoadParameters()'

collect2.exe: error: ld returned 1 exit status

exit status 1
Error compiling for board Arduino/Genuino Uno.

You can probably ignore the warning about the duplicate definition - someone obviously did not tidy up the library properly

You are calling a function called LoadParameters() on line 112 but that function is not created anywhere.

What you have at line 80 is just a function definition. Somewhere you need to create the function

void LoadParameters() {



hm... I see what you mean, but criously enough i did not create the other function either but its not posting an error.

Honestly I was 99% certain the function was in the library since the guide i was reading did not have the function created in the main code (sousviduino guide from Adafruit). This certainly throws a wrench into my plans XD

Thanks for your help either way.