Grammatical error - misuse of a homophonic phrase
People make this error because "must of" is a phonetic misinterpretation of the contraction "must've," which stands for "must have." In spoken English, "must've" sounds similar to "must of," leading to confusion in writing.
The correct phrase is "must have" or its contraction "must've," which is used to express a logical deduction about a past event.
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