It is possible the fruit you took the seeds from was from a hybrid plant. Therefore you can't expect the seeds to grow into a plant that will produce fruit. Hence the necessity for anyone who grows hybrids, to continue to purchase seeds in the future, because the seeds from a hybrid don't grow true to the parent plant.

yes i understand about second generation hybrids not be true to their parents,,,,these plants did not produce any flowers, from 20 seed/plants.