Проблема nested recycler view как решить?

Question

[egorchikJava]

При запуске фрагмента с ресайклерами выдает такую ошибку
java.lang.NullPointerException: Attempt to read from field 'android.view.View androidx.recyclerview.widget.RecyclerView$ViewHolder.itemView' on a null object reference

Fragment где должны показываться recycler view

ItemsetestAdapter itemsetestAdapter;
ArrayList<ParentItem>parentItemArrayList;
ArrayList<ChildrenItems>childrenItemsArrayList;
  private RecyclerView reccart;






String[]tovarcartShopuid={"Uidfigi","opddopddpdp","flfofofof"};
String[]tovarname={"Burger","Salo","Cola"};
int[]tovarImage={R.drawable.apteka,R.drawable.cake,R.drawable.clietu};
int[]MagLogo={R.drawable.apteka,R.drawable.build,R.drawable.butt};
parentItemArrayList=new ArrayList<>();
childrenItemsArrayList=new ArrayList<>();

for (int i=0;i<tovarcartShopuid.length;i++){

    ParentItem parentItem=new ParentItem(tovarcartShopuid[i],"Productsmagaz",MagLogo[i]);
    parentItemArrayList.add(parentItem);
    if (i<tovarname.length){
        ChildrenItems childrenItems=new ChildrenItems(tovarname[i],"test","test2","test3","test4",tovarImage[i]);
        childrenItemsArrayList.add(childrenItems);
    }
}
itemsetestAdapter=new ItemsetestAdapter(getActivity(),parentItemArrayList,childrenItemsArrayList);
LinearLayoutManager linearLayoutManager=new LinearLayoutManager(getContext());
reccart.setLayoutManager(linearLayoutManager);
reccart.setAdapter(itemsetestAdapter);

ParentItem class

public class ParentItem {
    String tovarcartShopuid,MagName;
    int MagLogo;
    public ParentItem(){
    }


    public ParentItem(String tovarcartShopuid,String MagName,int MagLogo) {
        this.tovarcartShopuid = tovarcartShopuid;
        this.MagLogo=MagLogo;
        this.MagName=MagName;
    }

    public int getMagLogo() {
        return MagLogo;
    }

    public void setMagLogo(int magLogo) {
        MagLogo = magLogo;
    }

    public String getMagName() {
        return MagName;
    }

    public void setMagName(String magName) {
        MagName = magName;
    }

    public String getTovarcartShopuid() {
        return tovarcartShopuid;
    }

    public void setTovarcartShopuid(String tovarcartShopuid) {
        this.tovarcartShopuid = tovarcartShopuid;
    }
}

ChildrenItems

public class ChildrenItems {
    private String tovarcartShopuid,TovarValue,ProductId,Price,tovarname;
    int tovarImage;
    public ChildrenItems(){

    }

    public ChildrenItems(String tovarcartShopuid, String tovarValue, String productId, String price, String tovarname,int tovarImage) {
        this.tovarcartShopuid = tovarcartShopuid;
       this. TovarValue = tovarValue;
      this.  ProductId = productId;
     this.   Price = price;
        this.tovarname = tovarname;
        this.tovarImage = tovarImage;
    }

    public int getTovarImage() {
        return tovarImage;
    }

    public void setTovarImage(int tovarImage) {
        this.tovarImage = tovarImage;
    }

    public String getTovarcartShopuid() {
        return tovarcartShopuid;
    }

    public void setTovarcartShopuid(String tovarcartShopuid) {
        this.tovarcartShopuid = tovarcartShopuid;
    }

    public String getTovarValue() {
        return TovarValue;
    }

    public void setTovarValue(String tovarValue) {
        TovarValue = tovarValue;
    }

    public String getProductId() {
        return ProductId;
    }

    public void setProductId(String productId) {
        ProductId = productId;
    }

    public String getPrice() {
        return Price;
    }

    public void setPrice(String price) {
        Price = price;
    }

    public String getTovarname() {
        return tovarname;
    }

    public void setTovarname(String tovarname) {
        this.tovarname = tovarname;
    }


}

ItemsetestAdapter class

public class ItemsetestAdapter extends RecyclerView.Adapter<ItemsetestAdapter.ViewHolder> {
    private Activity activity;
    ArrayList<ParentItem>parentItemArrayList;
    ArrayList<ChildrenItems>childrenItemsArrayList;


    public ItemsetestAdapter(Activity activity, ArrayList<ParentItem> parentItemArrayList, ArrayList<ChildrenItems> childrenItemsArrayList) {
        this.activity = activity;
        this.parentItemArrayList = parentItemArrayList;
        this.childrenItemsArrayList = childrenItemsArrayList;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {


        View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item,parent,false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
ParentItem parentItem=parentItemArrayList.get(position);

        ChildAdapter childAdapter=new ChildAdapter(childrenItemsArrayList);
        LinearLayoutManager linearLayoutManager=new LinearLayoutManager(activity);
        holder.nestedrecer.setLayoutManager(linearLayoutManager);
        holder.nestedrecer.setAdapter(childAdapter);
holder.textitogParent.setText(parentItem.tovarcartShopuid);




        Transformation transformation=new RoundedTransformationBuilder().borderColor(Color.WHITE).borderWidthDp(3).cornerRadius(15).oval(false).build();

        Picasso.get().load(parentItem.MagLogo).transform(transformation).into(holder.roundedImagemaglogo);

















    }

    @Override
    public int getItemCount() {
return parentItemArrayList.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder{
RoundedImageView roundedImagemaglogo;
RecyclerView nestedrecer;
TextView textitogParent;
AppCompatButton buylist;
ImageView imagedeletemag;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            nestedrecer=itemView.findViewById(R.id.nestedrecer);
            buylist=itemView.findViewById(R.id.buylist);
            textitogParent=itemView.findViewById(R.id.textitogParent);
            roundedImagemaglogo=itemView.findViewById(R.id.roundedImagemaglogo);
            imagedeletemag=itemView.findViewById(R.id.imagedeletemag);
        }
    }
}

ChildAdapter

public class ChildAdapter extends RecyclerView.Adapter<ChildAdapter.ViewHolder> {



    ArrayList<ChildrenItems>childrenItemsArrayList;

    public ChildAdapter(ArrayList<ChildrenItems> childrenItemsArrayList) {
        this.childrenItemsArrayList = childrenItemsArrayList;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.child_item,parent,false);






        return null;
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
ChildrenItems childrenItems=childrenItemsArrayList.get(position);


holder.textnamechild.setText(childrenItems.getTovarname());
holder.tovarcartchild.setText(childrenItems.getTovarValue());
holder.textpricechildtovar.setText(childrenItems.getTovarValue());














        Transformation transformation=new RoundedTransformationBuilder().borderColor(Color.WHITE).borderWidthDp(3).cornerRadius(15).oval(false).build();


        Picasso.get().load(childrenItems.getTovarImage()).transform(transformation).into(holder.imagetovarchild);




    }

    @Override
    public int getItemCount() {
        return childrenItemsArrayList.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder{

RoundedImageView imagetovarchild;
TextView textnamechild,textpricechildtovar,tovarpluschildto,tovarminuschildto,tovarcartchild;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            tovarpluschildto=itemView.findViewById(R.id.tovarpluschildto);
            tovarminuschildto=itemView.findViewById(R.id.tovarminuschildto);
            textpricechildtovar=itemView.findViewById(R.id.textpricechildtovar);

            imagetovarchild=itemView.findViewById(R.id.imagetovarchild);
            tovarcartchild=itemView.findViewById(R.id.tovarcartchild);


            textnamechild=itemView.findViewById(R.id.textnamechild);






        }
    }
}