The question was automatically deleted - something that happens to low-activity postssomething that happens to low-activity posts. You have the option of voting to undelete the post (from the linked answerlinked answer):
How can I undelete one of my posts?
Self-deleted posts can be viewed, edited, and undeleted by their original authors.
Note: deleted questions do not appear in search results, so you if you wish to later undelete a question that you've deleted you must have saved the URL somewhere. Users with 10K reputation and up can also mark questions as a "favorite" and find them later from the Favorites tab on their profiles.
If your post was deleted by trusted users, it will require three undelete votes to be undeleted - politely asking for this on Meta may attract the necessary votes if you make a good case for why the question should be restored.
If your post was deleted by a moderator, you can flag one of your other posts and write a note in the "other" section explaining the situation and requesting undeletion.
However, from the likes of it, this doesn't seem like a problem at all. Someone in a similar boat may just wait that little bit longer and not experience the "problem" at all. Reasons for undeleting a post should include a consideration for whether the post (question and answer) would be useful for a broader audience. In my opinion, this is not really the case.