سلام خسته نباشید                                                                                                                                         ببخشید دوستان من به ی اروری برخوردم که هرچی خواستم برطرف کنم نتونستم حتی کد‌های خود استادم کپی کردم و 

        توی پروژه خودم پیست کردم ولی بازم همون ارور داد ولی وقتی پروژه ی استاد ران میکنم اجرا میشه

این ارور هستش
Unable to start activity ComponentInfo{com.example.nike/com.example.nike.featuer.main.MainActivity}: java.lang.NullPointerException: latestProductsRv must not be null
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3303)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3411)
       at android.app.ActivityThread.-wrap12(Unknown Source:0)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1994)
       at android.os.Handler.dispatchMessage(Handler.java:108)
       at android.os.Looper.loop(Looper.java:166)
       at android.app.ActivityThread.main(ActivityThread.java:7529)
       at java.lang.reflect.Method.invoke(Native Method)
       at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:921)
    Caused by: java.lang.NullPointerException: latestProductsRv must not be null
       at com.example.nike.featuer.main.MainFragment.onViewCreated(MainFragment.kt:43)

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <androidx.core.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="56dp"
                android:layout_gravity="center_horizontal"
                app:srcCompat="@drawable/ic_nike_logo" />
            <FrameLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <EditText
                    android:layout_width="match_parent"
                    android:layout_height="46dp"
                    android:layout_marginStart="16dp"
                    android:layout_marginEnd="16dp"
                    android:background="@drawable/backgraund_et_serach"
                    android:hint="جستجو"
                    android:paddingStart="54dp"
                    android:paddingEnd="16dp"
                    android:textColor="?colorOnSurface"
                    android:textColorHint="?android:textColorSecondary"
                    android:textSize="15sp" />
                <ImageView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="start|center_vertical"
                    android:layout_marginStart="38dp"
                    app:srcCompat="@drawable/ic_baseline_search_24" />
            </FrameLayout>
            <FrameLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <androidx.viewpager2.widget.ViewPager2
                    android:id="@+id/bannerSliderViewPager"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="16dp" />
                <com.tbuonomo.viewpagerdotsindicator.DotsIndicator
                    android:id="@+id/sliderIndicator"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="bottom|center_horizontal"
                    android:layout_marginBottom="12dp"
                    app:dotsColor="#E0DCDC"
                    app:dotsCornerRadius="8dp"
                    app:dotsSize="5dp"
                    app:dotsSpacing="3dp"
                    app:dotsWidthFactor="4"
                    app:progressMode="false"
                    app:selectedDotColor="@color/black" />
            </FrameLayout>
            <FrameLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:paddingStart="16dp"
                android:paddingEnd="16dp">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/lasted"
                    android:layout_gravity="center_vertical|start"
                    android:textAppearance="?textAppearanceHeadline6"
                    android:textColor="?android:textColorSecondary" />
                <com.google.android.material.button.MaterialButton
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/viewAll"
                    style="@style/Widget.MaterialComponents.Button.TextButton"
                    android:layout_gravity="end|center_vertical"/>
            </FrameLayout>
            <androidx.recyclerview.widget.RecyclerView
                android:id="@+id/latestProductsRv"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:paddingStart="12dp"
                android:paddingEnd="12dp"
                android:clipToPadding="false"/>
        </LinearLayout>
    </androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>

package com.example.nike.featuer.main
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.lifecycle.observe
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import androidx.viewpager2.widget.ViewPager2
import com.example.nike.R
import com.example.nike.common.MetricsUtil.convertDpToPixel
import com.example.nike.common.NikeFragment
import com.example.nike.data.Product
import com.example.nike.featuer.banner.BannerSliderAdapter
import com.example.nike.featuer.rvadpter.ProductListAdapter
import com.tbuonomo.viewpagerdotsindicator.DotsIndicator
import org.koin.android.ext.android.inject
import org.koin.android.viewmodel.ext.android.viewModel
import timber.log.Timber
class MainFragment : NikeFragment() {
    val mainViewModel: MainViewModel by viewModel()
    val productListAdapter: ProductListAdapter by inject()
    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_main, container, false)
    }
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        val latestProductsRv = view.findViewById<RecyclerView>(R.id.latestProductsRv)
        val bannerSliderViewPager = view.findViewById<ViewPager2>(R.id.bannerSliderViewPager)
        val sliderIndicator = view.findViewById<DotsIndicator>(R.id.sliderIndicator)
        latestProductsRv.layoutManager =
            LinearLayoutManager(requireContext(), RecyclerView.HORIZONTAL, false)
        latestProductsRv.adapter = productListAdapter
        mainViewModel.productsLiveData.observe(viewLifecycleOwner) {
            Timber.i(it.toString())
            productListAdapter.products= it as ArrayList<Product>
        }
        mainViewModel.progressBarLiveData.observe(viewLifecycleOwner) {
            setProgressIndicator(it)
        }
        mainViewModel.bannersLiveData.observe(viewLifecycleOwner) {
            Timber.i(it.toString())
            val bannerSliderAdapter = BannerSliderAdapter(this, it)
            bannerSliderViewPager.adapter = bannerSliderAdapter
            val viewPagerHeight = (((bannerSliderViewPager.measuredWidth - convertDpToPixel(
                32f,
                requireContext()
            )) * 173) / 328).toInt()
            val layoutParams = bannerSliderViewPager.layoutParams
            layoutParams.height = viewPagerHeight
            bannerSliderViewPager.layoutParams = layoutParams
            sliderIndicator.setViewPager2(bannerSliderViewPager)
        }
    }