Ошибка java.lang.NullPointerException

public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
 
    private LayoutInflater inflater;
    private  String[] lTitles;
    private   String[] lContent;
    Adapter(Context context, String[] titles, String[] contents){
        this.inflater = LayoutInflater.from(context);
        this.lTitles = titles;
        this.lContent = contents;
 
    }
 
 
    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = inflater.inflate(R.layout.custom_view, viewGroup, false);
        return new ViewHolder(view);
    }
 
    @Override
    public void onBindViewHolder(@NonNull ViewHolder viewHolder, int i) {
 
        String title = lTitles[i];
        String content = lContent[i];
        viewHolder.lessonsTitle.setText(title);
        viewHolder.lessonsContent.setText(content);
 
    }
 
    @Override
    public int getItemCount() {
        return lTitles.length;
    }
 
    public class ViewHolder extends RecyclerView.ViewHolder {
 
        TextView lessonsTitle;
        TextView lessonsContent;
 
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent i = new Intent(v.getContext(),Details.class);
                    i.putExtra("titleLessons",lTitles[getAdapterPosition()]);
                    i.putExtra("contentLessons",lContent[getAdapterPosition()]);
                    v.getContext().startActivity(i);
                }
            });
            lessonsTitle = itemView.findViewById(R.id.lessonsTitle);
            lessonsContent = itemView.findViewById(R.id.lessonsContent);
        }
    }
}

public class Details extends AppCompatActivity {
    TextView lessonsContent;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_details);
 
        lessonsContent = findViewById(R.id.ContentofLessons);
        Intent i = getIntent();
        String title = i.getStringExtra("titleLessons");
        String content = i.getStringExtra("contentLessons");
 
        getSupportActionBar().setTitle(title);
 
        lessonsContent.setText(content);
        lessonsContent.setMovementMethod(new ScrollingMovementMethod());
 
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 
 
    }
}

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_details);
 
        lessonsContent = findViewById(R.id.ContentofLessons);
        !Intent i = getIntent();
        !String title = i.getStringExtra("titleLessons");
        !String content = i.getStringExtra("contentLessons");
 
        !getSupportActionBar().setTitle(title);
 
        lessonsContent.setText(content);
        !lessonsContent.setMovementMethod(new ScrollingMovementMethod());
 
        !getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 
 
    }