Operator not applicable to this operand type 咋办?该如何解决

Operator not applicable to this operand type 咋办??

var
  GuildRank: pTGuildRank;
  GuildUserInfo: pTGuildUserInfo;
  i: Integer;
begin
  for GuildRank in RankList do //出现 Operator not applicable to this operand type
  begin // 出现 [Error] Expression expected but 'BEGIN' found
    for I := 0 to GuildRank.MembersList.Count - 1 do
    begin
      GuildUserInfo := pTGuildUserInfo(GuildRank.MembersList.Objects[I]);
      Dispose(GuildUserInfo);
    end;
    GuildRank.MembersList.Free;
    Dispose(GuildRank);
  end;
  RankList.Clear;
end;