expected initializer before 'qtr'

i just started with arduino for school and i know the basics.
but no matter what i try i can't solve this one.

this is my code

// you made need to install the old version (3.0) of QTRSensors.h library in Arduino IDE
#include <QTRSensors.h>
#include <Adafruit_NeoPixel.h>

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(8, 10); // NumPixels, Pin

// Arduino Mega - connect QTR wires to Analog pins 0 - 7
QTRSensors RC qtr((unsigned char[]) {54, 55, 56, 57, 58, 59, 60, 61}, 8); // Mega code

// Arduino Uno - connect QTR wires to Analog pins 0 - 5
// QTRSensorsRC qtr((unsigned char[]) {14, 15, 16, 17, 18, 19}, 6); // Uno code

unsigned int sensor[8]; // used to store the value each sensor reads

// change these to set the the threshold for each sensor to detect a line
int Threshold[8] = {700, 700, 700, 700, 700, 700, 700, 700};

// connect motor controller pins to Arduino digital pins
int enA = 2; int in1 = 3; int in2 = 4; // motor 1
int in3 = 5; int in4 = 6; int enB = 7; // motor 2

void Stop() // stop robot
{
digitalWrite(in1, LOW);
digitalWrite(in2, LOW);
digitalWrite(in3, LOW);
digitalWrite(in4, LOW);
}

void Forward (int LeftSpeed, int RightSpeed) // range 0 - 255
{
digitalWrite(in1, HIGH); // turn on left motor to forward
digitalWrite(in2, LOW);
analogWrite(enA, LeftSpeed);
digitalWrite(in3, HIGH); // turn on right motor to forward
digitalWrite(in4, LOW);
analogWrite(enB, RightSpeed);
}

void Reverse (int LeftSpeed, int RightSpeed) // range 0-255
{
digitalWrite(in1, LOW); // turn on left motor to forward
digitalWrite(in2, HIGH);
analogWrite(enA, LeftSpeed);
digitalWrite(in3, LOW); // turn on right motor to forward
digitalWrite(in4, HIGH);
analogWrite(enB, RightSpeed);
}

void SetPixelsToSensors() // turn on NeoPixels that are less than threshold value
{
for (int n=0; n<=7; n++)
{
if (sensor[n] < Threshold[n])
pixels.setPixelColor(7-n, pixels.Color(40,40,40));
else
pixels.setPixelColor(7-n, pixels.Color(0,0,0));
pixels.show();
}
}

void setup()
{
// set all the motor control pins to outputs
pinMode(enA, OUTPUT);
pinMode(enB, OUTPUT);
pinMode(in1, OUTPUT);
pinMode(in2, OUTPUT);
pinMode(in3, OUTPUT);
pinMode(in4, OUTPUT);

Serial.begin(9600); // used to write to serial monitor
pixels.begin(); // initialize NeoPixels

// set up pushbutton
pinMode(53,INPUT_PULLUP);

while (digitalRead(53) != LOW) // loop until pushbutton is pressed
{
//for testing QTR, print the sensor values to Serial Monitor
qtr.read(sensor);
SetPixelsToSensors();
Serial.print(sensor[0]); Serial.print(" "); Serial.print(sensor[1]); Serial.print(" ");
Serial.print(sensor[2]); Serial.print(" "); Serial.print(sensor[3]); Serial.print(" ");
Serial.print(sensor[4]); Serial.print(" "); Serial.print(sensor[5]); Serial.print(" ");
Serial.print(sensor[6]); Serial.print(" "); Serial.print(sensor[7]); Serial.print("\n");
delay(500);
}
Forward(50,50);
}

void loop()
{
qtr.read(sensor);
SetPixelsToSensors();

if (sensor[0] < Threshold[0])
{
Forward(10,60);
}
else if (sensor[7] < Threshold[7])
{
Forward(60,10);
}
else if (sensor[1] < Threshold[1])
{
Forward(25,60);
}
else if (sensor[6] < Threshold[6])
{
Forward(60,25);
}
else if (sensor[5] < Threshold[5])
{
Forward(60,40);
}
else if (sensor[2] < Threshold[2])
{
Forward(40,60);
}
else if (sensor[3] < Threshold[3] || sensor[4] < Threshold[4])
{
Forward(60,60);
}
else if (sensor[5] < Threshold[5])
{
Forward(60,40);
}
else
Forward(60,60);

delay(10);
}

What makes you think this is a bootloader issue?

QTRSensors RC qtr Right there.
What is "RC"?

honestly i don't know what i means. school gave us this code and told us that the objective was to get the car moving and following a line

There's a clue in the comment following the line I highlighted.

Are you using this type of sensors:QTRSensor.jpg (QTR-8RC reflectance sensor array) in your project? If so, open an example from the IDE of the QTRSensor Library and compare your codes to see the differences in the style of sketch composition.

QTRSensor.jpg

QTRSensors RC qtr(stuff); is not valid C syntax.

I suspect that as TMFKaAWOL hinted at, the correct line would be:

QTRSensorsRC qtr(stuff);

(that, is, you have a space in the middle of the class name)