Laravel未定义的偏移量:1 -由路由引起

我得到错误时，试图使后呼叫/api/subject/search

我想这是一个简单的语法错误，我错过了

我的api路由定义在

Route::group(array('prefix' => 'api'), function()
{
    Route::post('resource/search', 'ResourceController');
    Route::resource('resource', 'ResourceController');

    Route::post('subject/search', 'SubjectController');
    Route::resource('subject', 'SubjectController');
    Route::resource('user', 'UserController');
    Route::controller('/session', 'SessionController');
    Route::post('/login', array('as' => 'session', 'uses' => 'SessionController@Store'));
});

我的控制器大部分是空的

class SubjectController extends 'BaseController 
{
    public function search()
    {
        $subjects = [];
        if((int)Input::get('grade_id') < 13 && (int)Input::get('grade_id') > 8)
            $subjects = Subject::where('name', 'like', '%HS%')->get();
        else
            $subjects = Subject::where('name', 'not like', '%HS%')->get();
        return Response::json([
            'success' => true,
            'subjects' => $subjects->toArray()
        ]);
    }
    /**
     * Display a listing of the resource.
     *
     * @return Response
     */
    public function index()
    {
            //
    }
    /**
     * Show the form for creating a new resource.
     *
     * @return Response
     */
    public function create()
    {
            //
    }
    /**
     * Store a newly created resource in storage.
     *
     * @return Response
     */
    public function store()
    {
            //
    }
    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return Response
     */
    public function show($id)
    {
            //
    }
    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     * @return Response
     */
    public function edit($id)
    {
            //
    }
    /**
     * Update the specified resource in storage.
     *
     * @param  int  $id
     * @return Response
     */
    public function update($id)
    {
            //
    }
    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return Response
     */
    public function destroy($id)
    {
            //
    }
}