Error SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails

Here is my create post form

    {!! Form::open(['route' => 'news.store', 'files'=>true])   !!}
   <!-- {!! Form::hidden('User_id', Auth::user()->id) !!} -->
<div class="container-fluid">
<div class="row">
    <div class="col-md-12">
        <form role="form">
            <div class="form-group">
                 
        {!! Form::label('title', 'Title:') !!}
        {!! Form::text('title', null, ['class'=>'form-control']) !!}
            </div>
            <div class="form-group">
                 
                 {!! Form::label('body', 'body:') !!}
        {!! Form::textarea('body', null, ['class'=>'ckeditor', 'rows'=>5] ) !!}
            </div>
            <div class="form-group">
        {!! Form::label('image', 'Choose an Image') !!}
        {!! Form::file('image') !!}
        </div>
        <div class="form-group">
                 {!! Form::label('tags', 'tags:') !!}
        {!! Form::select('tags[]', $tags, null, ['class'=>'form-control', 'multiple']) !!}
            </div>
            <div class="checkbox">
                 
                <label>
                    <input type="checkbox" /> I Accept
                </label>
             </div> 
            <div class="form-group">
        {!! Form::submit('Save', array( 'class'=>'btn btn-danger form-control' )) !!}

here is my controller

    public function store(Request $request)
     {   
    $this->validate($request, [
        'title' => 'required|max:255',
        'body' => 'required|max:100000',
        'image' => 'image',
    ]);

    
    $news = new news;
    $news->tags()->attach($request->input('tags'));
    $news->title = $request->title;
    $news->body = $request->body;
    if($request->hasFile('image')) {
        $file = Input::file('image');
        //getting timestamp
        $timestamp = str_replace([' ', ':'], '-', Carbon::now()->toDateTimeString());
        
        $name = $timestamp. '-' .$file->getClientOriginalName();
        
        $news->image = $name;

        $file->move(public_path().'/../public_html/news_image/', $name);

        $thumb = Image::make(public_path().'/../public_html/news_image/' . $name)->resize(484, 300)-        >save(public_path().'/../public_html/news_image/thumb/thumb' . $name, 50);
    }

    $news->save();

    return redirect()->route('news.index');
        }

this is my database migration

    <?php

    use Illuminate\Database\Schema\Blueprint;
    use Illuminate\Database\Migrations\Migration;

class CreateNewsTable extends Migration
{
    /**
    * Run the migrations.
    *
    * @return void
    */
    public function up()
    {
     Schema::create('news', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('user_id')->unsigned();
        $table->string('title');
        $table->text('body');
        $table->string('image')->default('defaulttagimage.jpg');
        $table->timestamps();
        $table->foreign( 'user_id' )->references( 'id' )->on( 'users' );
    });
}

/**
 * Reverse the migrations.
 *
 * @return void
 */
public function down()
{
    Schema::drop('news');
    }
}

Getting error when i create new post with tags
SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (latest.news_tag, CONSTRAINT news_tag_news_id_foreign FOREIGN KEY (news_id) REFERENCES news (id) ON DELETE CASCADE) (SQL: insert into news_tag (news_id, tag_id) values (, 3), (, 4))