Question

fix the pronoun error (if one exists).
simba tells each of his lemon trees a joke every day so their fruit wont be sour.
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Explanation:

The phrase "each of his lemon trees" refers to singular individual trees, so the possessive pronoun must match this singular context instead of the plural "their".

Answer:

Simba tells each of his lemon trees a joke every day so its fruit won't be sour.