未解析的引用：uiMode I saveToDataStore

问：

我是编程初学者，我面临着这组代码的问题，我无法理解问题并解决它，知道代码已经准备好了，不是我写的

package www.spikeysanju.jetquotes.view


import androidx.lifecycle.lifecycleScope
import dagger.hilt.android.AndroidEntryPoint
import kotlinx.coroutines.flow.collect
import kotlinx.coroutines.launch
import www.spikeysanju.jetquotes.data.preference.UIModeImpl
import www.spikeysanju.jetquotes.navigation.NavGraph
import www.spikeysanju.jetquotes.ui.JetQuotesTheme

import www.spikeysanju.jetquotes.R


@AndroidEntryPoint
class MainActivity : AppCompatActivity() {
    @Inject
    lateinit var uiModeDataStore: UIModeImpl

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        this.setContent {
            JetQuotesMain()
        }
        // observe theme change
        observeUITheme()

[] (https://i.stack.imgur.com/2f7pm.jpg)