Read the following text and answer the question.

An old man on the point of death summons his sons around him to give them some parting advice. He orders his servants to bring in a bundle of sticks and says to his eldest son, “Break it.” The son strains and strains, but with all his efforts, he is unable to break the bundle. The other sons also try, but none of them is successful. “Untie the bundle,” says the father, “and each of you takes a stick.” When they have done so, he calls out to them, “Now, break,” and each stick is easily broken. “You see my meaning,” says their father.

Source: High Interest Reading Comprehension Skills & Strategies Level 5

What's the problem with the writing of the story?