Load a save that isn't on a choice screen or place that the mod changed something. The start of the day is a good example of where to load from. It's very unlikely that none of your saves work, so try loading different ones.After I install this mod, it broke all my save files, they cannot be loaded anymore.
EDIT: Specifically, if a save file that is not directly leading to a special scene (for example: start of a day), that file cannot be loaded.