In my ClassConcept I have
private final map<string, T> map = new hashmap<string, T>;
private final <!TextGen not found for 'jetbrains.mps.baseLanguage.collections.structure.MapType'!> map = new <!TextGen not found for 'jetbrains.mps.baseLanguage.collections.structure.HashMapCreator'!>;
I understand that I'm missing something, but what? Tried everything I was able to think of.