E2217 Published field '%s' not a class or interface type (Delphi)

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An attempt has been made to publish a field in a class which is not a class nor interface type.

program Produce;

  type
    TBaseClass = class
    published
      x : Integer;
    end;
begin
end.

The program above generates an error because x is included in a published section, despite the fact that it is not of a type which can be published.

program Solve;
  type
    TBaseClass = class
      Fx : Integer;
    published
      property X : Integer read Fx write Fx;
    end;

begin
end.

To solve this problem, all fields which are not class nor interface types must be removed from the published section of a class. If it is a requirement that the field actually be published, then it can be accomplished by changing the field into a property, as was done in this example.