E2602

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This error message is issued when an identifier in the parameter list given to Dispose is not a destructor.

type
  PObj = ^TObj;
  TObj = object
    FData: Integer;
    destructor Finalize;
  end;

var
  R: PObj;

destructor TObj.Finalize;
begin
end;

begin
  Dispose(R, Foo);  // issues error: E2602
end.

The solution is to either pass a destructor to Dispose, or to eliminate the second argument.

type
  PObj = ^TObj;
  TObj = object
    FData: Integer;
    destructor Finalize;
  end;

var
  R: PObj;

destructor TObj.Finalize;
begin
end;

begin
  Dispose(R, Finalize); // ok
end.