"Where is my house?"
Translation:Де мій будинок?
Do you use transliteration? If you get a typo message it may be a bug in Duolingo. I would suggest switching to the Cyrillic script.
Хата is a (traditional) village house. In the colloquial speech, it could be used to mean any kind of private housing (a house, a flat, ...), often, in the diminutive meaning.