Catherine goes to her local movie theater only to see romantic comedies. Since Catherine did not go to the movies yesterday, there is not a romantic comedy playing at her local theater.

The reasoning above is flawed because the evidence

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provided does not necessarily support the conclusion. Just because Catherine did not go to the movies yesterday does not mean that there are no romantic comedies playing at her local theater today. The conclusion draws an incorrect link between Catherine's absence yesterday and the absence of a romantic comedy today.

To correct the flaw in the reasoning, we need more information about the movie theater's schedule for today. We would need to know the movie listings for the day or have some other evidence indicating that no romantic comedy is indeed playing. Without such additional information, we cannot make a valid conclusion based solely on Catherine's absence from the theater yesterday.