Cannot create an instance of class ViewModel kotlin

Question

Here is my code

class BookmarkViewModel(app: Application) : AndroidViewModel(app) {

    private val dao = BookmarkDb.get(app).bookmarkDao()

    companion o         


        

Answer 1

Change viewModel = ViewModelProviders.of(activity!!).get(BookmarkViewModel::class.java)

to viewModel = ViewModelProviders.of(this).get(BookmarkViewModel::class.java)

Furthermore don't instantiate the viewModel to null. Change it to a lateinit var this way you don't have to instantiate immediately (but you are telling Kotlin that you will instantiate it before accessing it). You can do this like so: private lateinit var viewModel: BookMarkViewModel

EDIT The root of the problem was that the Room Dependencies where either not on the same version or annotationProcessor was used instead of kapt (kapt is required when using Kotlin)