小编Roc*_* E.的帖子

Unsolvable problem when I try to start my app. I'm using Room database and databinding. I've located the problem to originate from my database class but cannot seem to find a solution for the problem

@Database(entities = [FietsItem::class, Merk::class], version = 5, exportSchema = false)
abstract class FietsDatabase : RoomDatabase() {
    abstract fun fietsDao(): FietsDao
    abstract fun merkDao(): MerkDao

    companion object{
        @Volatile
        private var databaseInstance: FietsDatabase? = null

        fun getDatabaseInstance(mContext: Context): FietsDatabase =
            databaseInstance
                ?: synchronized(this){
                    databaseInstance
                        ?: buildDatabaseInstance(
                            mContext …