View Compilation Error

0_0_21809249_22885.cpp: In function 'int main()':
0_0_21809249_22885.cpp:3:2: error: 'Singleton' was not declared in this scope
  Singleton* pSingleton1 = Singleton::GetInstance();
  ^
0_0_21809249_22885.cpp:3:13: error: 'pSingleton1' was not declared in this scope
  Singleton* pSingleton1 = Singleton::GetInstance();
             ^
0_0_21809249_22885.cpp:3:27: error: 'Singleton' is not a class, namespace, or enumeration
  Singleton* pSingleton1 = Singleton::GetInstance();
                           ^
0_0_21809249_22885.cpp:5:13: error: 'pSingleton2' was not declared in this scope
  Singleton* pSingleton2 = Singleton::GetInstance();
             ^
0_0_21809249_22885.cpp:5:27: error: 'Singleton' is not a class, namespace, or enumeration
  Singleton* pSingleton2 = Singleton::GetInstance();
                           ^