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

suggests that if Catherine had gone to the movies yesterday there would be a romantic comedy playing today.

does not necessarily support the conclusion. Just because Catherine did not go to the movies yesterday does not mean that there is no romantic comedy playing at her local theater today. The evidence provided only tells us about yesterday, not about the current day.

To properly evaluate whether there is a romantic comedy playing at Catherine's local theater today, we would need to gather more information about the movie schedule for the current day. This could include checking the theater's website, calling the theater, or looking at online movie listings. By doing so, we can confirm whether or not there is a romantic comedy playing at Catherine's local theater today.