Problem with Injection of DAO about dagger HOT 1 OPEN

Generally questions like this are better for StackOverflow.

However, I believe the issue is you are providing your UserDAO using a qualifier here:

@Singleton
@Provides
@UserDAO
fun provideUserDao(
    @Database appDatabase: AppDatabase
): UserDao {
    return appDatabase.userDao()
}

but are injecting it without the @UserDao qualifier here:

class UserRepository @Inject constructor(
private val dao: UserDao
) {

How to fix it is a bit up to you. You could either add a qualifier where you use it in UserRepository or you could just remove the qualifier from the @Provides. The reason I mention the latter is that qualifiers are used for differentiating bindings, so it'd usually make sense to use one if you had two different UserDaos, like @Red UserDao and @Blue UserDao. Something like @UserDAO UserDao doesn't really differentiate much, so you might not need the qualifier in the first place if you only plan on having one UserDao binding.

from dagger.