Laravel Search function

Hi guys, i have a question about the Laravel search function, i had follow the guildeline online and i still fail to search the category, can someone guide me and tell me where i did wrongly ? Much appreciated

My category Controller php code:

    public function search(Request $request)
{
    $search = $request->get('search');
    $posts = DB::table('bit_app_policy_category')->where('id','like','%' .$search. '%')->paginate(5);
    return view('category.index',['posts' => $posts]);
}

My index.blade code

   <div align="left">
            <div class="col-md-4">
                <h1>Policy</h1>


            </div>
            <div class="col-md-4">
                <form action="/search" method="get" role="search">
                    
                    <div class="input-group">
                        <input type="text" class="form-control" name="_method" placeholder="Search ID / Code"> <span class="input-group-btn">
                            <button type="submit" class="btn btn-primary">Search</button></span>
                    </div>
                </form>
            </div>
        </div>

web.php

Route::get('/search','categoryController@search');

What error i get is here Error image

via Chebli Mohamed