E2019 Object type required (Delphi)

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This error is given whenever an object type is expected by the compiler. For instance, the ancestor type of an object must also be an object type.

type
  MyObject = object(TObject)
  end;
begin
end.

Confusingly enough, TObject in the unit System has a class type, so we cannot derive an object type from it.

program Solve;
type
  MyObject = class  (*Actually, this means: class(TObject)*)
  end;
begin
end.

Make sure the type identifier really stands for an object type - maybe it is misspelled, or maybe is hidden by an identifier from another unit.