Trying to get this program to work... weird error can someone explain please?

CISPStudent (3)
Write your question here.
undefined reference to `main'
collect2: error: ld returned 1 exit status

I have not seen this error before can someone explain please
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#include <iostream>
using namespace std;

class LED
{ private:
  int bulbLife = 100;
  int bulbColor = 0;
  public:
  int getColor()
  {return bulbColor;}
  void setLife(int use)
  {bulbLife -= use;}
  int getLife()
  {return bulbLife;}
};

class StopLight
{ private:
  LED socket1;
  public:
  void Cycle();
  void Report();
  };
  void StopLight::Cycle()
  {
    socket1.setLife(1);
    cout << "\nSteady";
    switch (socket1.getColor())
    {
      case 0: cout << "White\n\n"; break;
      case 1: cout << "Red\n\n"; break;
      case 2: cout << "Yellow\n\n"; break;
      case 3: cout << "Green\n\n"; break;
    }
  }
  void StopLight::Report()
  {
    cout << "Bidwell Light Report/n" << "Power On: True" << endl;
    cout << "Socket 1:" << socket1.getColor() << "  "
    << socket1.getLife() << "hours left" << endl;
  }
Repeater (3046)
Your program has no main() function. Where is it meant to start?
CISPStudent (3)
Lol okay yeah i see it. Im so sorry thank you
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