The type of error in the given sentence is a faulty pronoun.
What is a Pronoun?
This refers to the use of words that replace a noun in a given sentence.
Hence, we can see that from the given sentence, there is the use of words that improperly show the subject-verb concord as the word "their" should be used instead of "his" because they are talking about two people; Eli and Matthew.
Read more about faulty pronouns here:
https://brainly.com/question/6866012
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