I accidentally deleted ‘example.com’ site under /admin after creating a new site name. After click save then I got ‘500 internal server error’. I remember did this before in the past but just reinstalled to get it worked again. I searched around but couldn’t find the answer to why example.com site name cannot be deleted. Or I miss some step after or before deleting it? Appreciated if someone can provide me a link explaining about this or know to fix this error and not have to reinstall the whole thing over again.