Error
TypeError: Error #1009: Cannot access a property or method of a null object reference. at widgets.CAS.Customizer::CatalogPanel/NotifyRemovedParts() at widgets.CAS.Customizer::CASCustomizerM...
Forum Discussion
Nothing here gives enough information to offer you support.
If you have mods/CC at all, please indicate that. Also please indicate what symptoms you have. If you want to post an exception, it needs to be an entire file.
For info on mod/CC issues, start at https://forums.ea.com/discussions/the-sims-4-mods-and-custom-content-en/mod--cc-issues-start-here/5035292
