Open up the LoadLevel.cpp file and add the call to the new populateEmitters function, as highlighted in the following code:

void Engine::loadLevel() 
{ 
   m_Playing = false; 
 
   // Delete the previously allocated memory 
   for (int i = 0; i < m_LM.getLevelSize().y; ++i) 
   { 
      delete[] m_ArrayLevel[i]; 
 
   } 
   delete[] m_ArrayLevel; 
 
   // Load the next 2d array with the map for the level 
   // And repopulate the vertex array as well 
   m_ArrayLevel = m_LM.nextLevel(m_VALevel); 
 
   // Prepare the sound emitters
   populateEmitters(m_FireEmitters, m_ArrayLevel); 
 
   // How long is this new time limit 
   m_TimeRemaining = m_LM.getTimeLimit(); 
 
   // Spawn Thomas and Bob 
   m_Thomas.spawn(m_LM.getStartPosition(), GRAVITY); 
   m_Bob.spawn(m_LM.getStartPosition(), GRAVITY); 
 
   // Make sure this code isn't run again 
...