Class.getConstructor fails to find compatible constructor

Having problems with a factory class, I pass in a human readable name that maps to a class that has a single constructor with a single argument, I get the following error:

java.lang.NoSuchMethodException: com.satgraf.evolution2.observers.VSIDSTemporalLocalityEvolutionObserver.<init>(com.satlib.evolution.ConcreteEvolutionGraph)
at java.lang.Class.getConstructor0(Class.java:2892)
at java.lang.Class.getConstructor(Class.java:1723)
at com.satlib.evolution.observers.EvolutionObserverFactory.getByName(EvolutionObserverFactory.java:84)
at com.satgraf.evolution2.UI.Evolution2GraphFrame.main(Evolution2GraphFrame.java:229) 

These are the classes in question, I have about a dozen of these things in different projects, they all work without problem - including one that is almost identical, can't see why this one is failing:

public EvolutionObserver getByName(String name, EvolutionGraph graph){
if(classes.get(name) == null){
  return null;
}
else{
  try {
    Constructor<? extends EvolutionObserver> con = classes.get(name).getConstructor(graph.getClass());
    EvolutionObserver i = con.newInstance(graph);
    observers.add(i);
    return i;
  } 
  catch (InvocationTargetException | InstantiationException | IllegalAccessException | NoSuchMethodException | IllegalArgumentException | SecurityException ex) {
    Logger.getLogger(EvolutionObserverFactory.class.getName()).log(Level.SEVERE, null, ex);
    return null;
  }
}
}

The class being instantiated is:

public class VSIDSTemporalLocalityEvolutionObserver extends JPanel implements EvolutionObserver{
    public VSIDSTemporalLocalityEvolutionObserver(EvolutionGraph graph){
    ...
    }
...
}

The argument graph is of type:

public class ConcreteEvolutionGraph extends ConcreteCommunityGraph implements EvolutionGraph{
    ...
}