Unknown errors.

thank you, i have changed that.

the compiler is still kicking out an error with

HardwareArduino:35: error: 'myStepper' does not name a type
myStepper.setSpeed(180);
^
exit status 1
'myStepper' does not name a type

just to show you the code:

#include <Stepper.h>
      //ints  
  String serialInput = "";
  int overrideButton = false; // turn override on
  int overrideOpen = false; // open curtains while in override
  bool openState = false; //check if open
  int ambient = ""; //collection for sensor
 const int stepsPerRevolution = 212; // motor revolution
  int motorMove = 3800; //how far the motor has to move to flly close the curtain
  int red = 0; //brightness out of 255
  int green = 0; //brightness out of 255
  int blue = 0; //brightness out of 255
  const byte numChars = 32;
  char receivedChars[numChars];
  boolean newData = false;
      //pins decleration
  int sensor = A4;
  int RX = 0;
  int TX = 1;
  int redButton = digitalRead(2);
  int redPin = 3;
  int blackButton = digitalRead(4);
  int greenPin = 5;
  int bluePin = 6;
  int motorPower = 7;
  int motor1 = 8;  
  int motor2 = 9;  
  int motor3 = 10;  
  int motor4 = 11;  
  int motor5 = 12;  
  int motor6 = 13;  

//unknow
Stepper myStepper(stepsPerRevolution, 8, 11, 12, 13);
myStepper.setSpeed(180);

void setup() {
  //arduino set up
  Serial.begin(9600); //start serial

//pinmodes
pinMode(2, INPUT); //button
pinMode(3, OUTPUT); //redled
pinMode(4, INPUT); //button
pinMode(5, OUTPUT); //greenled
pinMode(6, OUTPUT); //blueled
pinMode(7, OUTPUT); //motorpower
pinMode(8, OUTPUT); //motorcontrol
pinMode(9, OUTPUT); //motorsheildpower
pinMode(10, OUTPUT); //motorsheildpower
pinMode(11, OUTPUT); //motorcontrol
pinMode(12, OUTPUT); //motorcontrol
pinMode(13, OUTPUT); //motorcontrol

}

void loop() {
 
 while(!overrideButton) {
  
recvWithStartEndMarkers();
    showNewData();

  Serial.print(serialInput);
 serialInput;
serialInput = "";
  if (blackButton == HIGH) {
      overrideButton = !overrideButton;
    }
  }
 while (overrideButton == true) {
      if(blackButton == HIGH) {

      overrideButton = !overrideButton;
    }
  }
    if (redButton == HIGH) {
      overrideOpen = !overrideOpen;
    }
    if (overrideOpen == true) {
      curtainOpen();
    } else if (curtainOpen == false) {
      curtainClose();
    } else {
      for(int x = 0; x < 8; x++) {
      Serial.print("ERROR ");
      Serial.println("override function curtainopen not a bool!");
      }
    }
  }

int curtainOpen() {
 if (openState == false) {
  
  digitalWrite(7, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);

myStepper.step(motorMove);

  digitalWrite(7, LOW);
  digitalWrite(9, LOW);
  digitalWrite(10, LOW);
 }
 openState = true;
 Serial.println("Curtains are open"); 
}


int curtainClose() {
 if (openState == true) {
  
  digitalWrite(7, HIGH);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);

myStepper.step(-motorMove);

  digitalWrite(7, LOW);
  digitalWrite(9, LOW);
  digitalWrite(10, LOW);
 }
 openState = false;
 Serial.println("Curtains are closed"); 
}

int led() {
  digitalWrite(redPin, red);
  digitalWrite(greenPin, green);
  digitalWrite(bluePin, blue);
  
  Serial.print(" Red = ");
  Serial.print(red);
  Serial.print(";");
  Serial.print(" Green = ");
  Serial.print(green);
  Serial.print(";");
  Serial.print(" Blue = ");
  Serial.print(blue);
  Serial.println(";");
}

int brightness() {
  ambient = analogRead(sensor); 
  Serial.print("sensor = ");
  Serial.print(ambient);
  Serial.println(";");
}

void recvWithStartEndMarkers() {
    static boolean recvInProgress = false;
    static byte ndx = 0;
    char startMarker = '<';
    char endMarker = '>';
    char rc;
 
    while (Serial.available() > 0 && newData == false) {
        rc = Serial.read();

        if (recvInProgress == true) {
            if (rc != endMarker) {
                receivedChars[ndx] = rc;
                ndx++;
                if (ndx >= numChars) {
                    ndx = numChars - 1;
                }
            }
            else {
                receivedChars[ndx] = '\0'; // terminate the string
                recvInProgress = false;
                ndx = 0;
                newData = true;
            }
        }

        else if (rc == startMarker) {
            recvInProgress = true;
        }
    }
}

void showNewData() {
    if (newData == true) {
        serialInput = receivedChars;
        newData = false;
    }
}