how to fix Undefined variable: task (View: C:\Users\LIlan\Desktop\acxian\resources\views\files\form.blade.php) in Laravel 5.2

I am developing project management tool in laravel 5.2. In my application user can create a project and one project has many tasks and one task may have many files attachments. I am using cloudder to save My files. Currently I have assigned My project files to relevant projects only. Now, I need to display the files on each tasks of the relevant projects.

FileController

class FilesController extends Controller
    {

        public function uploadAttachments(Request $request, $id,$taskId) 
        {
             $this->validate($request, [
                'file_name'     => 'required|mimes:jpeg,bmp,png,pdf|between:1,7000',
            ]);

            $filename     = $request->file('file_name')->getRealPath();

            Cloudder::upload($filename, null);
            list($width, $height) = getimagesize($filename);

            $fileUrl = Cloudder::show(Cloudder::getPublicId(), ["width" => $width, "height" => $height]);
            $this->saveUploads($request, $fileUrl, $id,$taskId);

            return redirect()->back()->with('info', 'Your Attachment has been uploaded Successfully');
        }

        private function saveUploads(Request $request, $fileUrl, $id,$taskId)
        {
            $file = new File;
            $file->file_name  = $request->file('file_name')->getClientOriginalName();
            $file->file_url   = $fileUrl;
            $file->project_id = $id;
            $file->task_id = $taskId;

            $file->save();
        }

        return redirect()->route('projects.show')->with('info', 'File deleted successfully');
        }
    }

routes

Route::post('projects/{projects}/tasks/{tasks}/files', [
     'uses' => 'FilesController@uploadAttachments',
     'as'   => 'projects.files',
     'middleware' => ['auth']
]);

and file form is files/form.blade.php

<div class="row" style="border:1px solid #ccc;margin-left:5px;width:100%;padding:15px;">
     @foreach($project->files as $file)
                <div>
                    <div><i class="fa fa-check-square-o"></i>
                        <span>

                            <a href="" target="_blank"></a>
                  </span>
                    </div>
                </div>
                <hr/>
                @endforeach

        <form class="form-vertical" role="form"
                                    enctype="multipart/form-data"
                                    method="post"
                                    action="">//this is line 39
            <div class="form-group">
                <input type="file" name="file_name" class="form-control" id="file_name">
                @if ($errors->has('file_name'))
                    <span class="help-block"></span>
                @endif
            </div>

            <div class="form-group">
                <button type="submit" class="btn btn-info">Add Files</button>
            </div>

now I got this error

ErrorException in 88ff5154a46f749c29024e0c9f84c577f7c5025e.php line 39: Undefined variable: task (View: C:\Users\Lilan\Desktop\acxian\resources\views\files\form.blade.php)

how to fix this problem?

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