Hi,
If I see correctly, you are using Elementor posts widget to display the results – the properties are custom post types and the locations are taxonomy terms. And do you want to display locations as result? Or use them as a filter?
If you want to display as results, the problem with this is, that Elementor posts widget supports custom post types as results, but not taxonomy terms, so it won’t be able to display the locations, and that causes the error most likely.