Unable to upload a image ; laravel 6.0 - php

Question

I'm a new to Laravel and using Laravel6.0. While doing validation I'm getting a error.
The picture must be an image. The picture must be a file. The picture must be a file of type: jpeg, png, jpg, gif.
I'm searching a solution on google, but cannot find correct an answer.
I added dd(request) in my rules() ,but I got the same error.
This is my ContentController, ContentRequest and create.blade.php.
#extends('layouts.app')
#section('content')
<div class="card">
<div class="card-body">
<form action="{{route('content.store')}}" method="post"　enctype="multipart/form-data" >
#csrf
<div class="form-group">
<label for="exampleFormControlInput1">タイトル</label>
<input type="text" class="form-control" id="exampleFormControlInput1" placeholder="旅のタイトル" name="title" value="{{old('title')}}" >
</div>
<div class="form-group">
<label for="exampleFormControlSelect1">大陸名</label>
<select class="form-control" id="exampleFormControlSelect1" name="continent" value="{{old('continent')}}">
<option>アジア</option>
<option>北アメリカ</option>
<option>中南米</option>
<option>ヨーロッパ</option>
<option>アフリカ</option>
<option>オセアニア</option>
</select>
</div>
<div class="form-group">
<label for="exampleFormControlInput1">国名</label>
<input type="text" class="form-control" id="exampleFormControlInput1" placeholder="日本" name="country" value="{{old('country')}}">
</div>
<div class="form-group">
<label for="exampleFormControlSelect1">滞在期間</label>
<select class="form-control" id="exampleFormControlSelect1" name="span" placeholder="滞在期間を選択" >
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
<option>6</option>
<option>7</option>
<option>8</option>
<option>9</option>
<option>10</option>
<option>11</option>
　<option>12</option>
　<option>13</option>
　<option>14</option>
　<option>15</option>
　<option>16</option>
　<option>17</option>
</select>
</div>
<div class="form-group">
<label for="exampleFormControlSelect1">費用</label>
<select class="form-control" id="exampleFormControlSelect1" name="costs" placeholder="金額を選択" value='{{old('costs')}}'>
<option>10000</option>
<option>30000</option>
<option>50000</option>
<option>70000</option>
<option>100000</option>
<option>150000</option>
<option>200000</option>
<option>250000</option>
<option>300000</option>
</select>
</div>
<div class="form-group">
<label for="exampleFormControlFile1">写真</label>
<input type="file" class="form-control-file" id="exampleFormControlFile1" name="picture" value="{{old('picture')}}">
<div class="input-group-append">
<button type="submit" class="btn btn-outline-secondary reset"><i class="fas fa-times fa-fw"></i>取消</button>
</div>
</div>
<div class="form-group">
<label for="exampleFormControlTextarea1">コンテンツ</label>
<textarea class="form-control" id="exampleFormControlTextarea1" rows="5" name="content" >{{old('content')}}</textarea>
</div>
<input type="hidden" name="user_id" value="{{Auth::id()}}">
<button type="submit" class="btn btn-primary btn-lg btn-block">投稿</button>
</form>
</div>
</div>
#endsection
ContentRequest
public function rules()
{
return [
'user_id'=>'required',
'title' => 'required|string|max:255',
'continent' => 'required|string',
'picture'=>'required|image|max:1000',
'country' => 'required|string',
'costs'=>'required|numeric',
'span'=>'required|numeric',
'content'=>'required|string|max:250',
];
}
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\Http\Requests\ContentRequest;
use App\Content;
class ContentController extends Controller
public function store(ContentRequest $request)
{
if($request->validated()){
$content =new Content;
$filename = $request->file('image')->store('public/image');
$content->picture = basename($filename);
$content->user_id = $request->user_id;
$content->content = $request->content;
$content->title = $request->title;
$content->span = $request->span;
$content->continent = $request->continent;
$content->country = $request-> country;
$content->costs = $request->costs;
$content->save();
}
return redirect('/');
}

Answer 1

You have to use like this
'picture' => 'required|image|mimes:jpeg,jpg,png|max:1000',

Answer 2

try this
public function rules()
{
return [
'user_id'=>'required',
'title' => 'required|string|max:255',
'continent' => 'required|string',
'picture'=>'required|mimes:jpeg,png,jpg,gif|max:1000',
'country' => 'required|string',
'costs'=>'required|numeric',
'span'=>'required|numeric',
'content'=>'required|string|max:250',
];
}
and in the store function
if($request->validated()){
$content =new Content;
$filename = $request->file('image')->store('public/image');
$content->picture = basename($filename);
$content->user_id = $request->user_id;
$content->content = $request->content;
$content->title = $request->title;
$content->span = $request->span;
$content->continent = $request->continent;
$content->country = $request-> country;
$content->costs = $request->costs;
$content->save();
}