Hi,
Just to elaborate on what Daniel already said, Oliver, note that it is the 
constructor of the Step3-class that calls the constructor of FE_Q<dim>, 
that is

Step3::Step3()
  : fe(1)
  , dof_handler(triangulation)
{}

If you miss this call in the Step3-constructor, you will get the error you 
stated earlier.

Best,
Simon

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