Call to a member function getClientOriginalExtension() on a non-object

[user3647299 via StackOverflow]

I am using laravel 4 and I am trying to upload images into a folder and save the name in database. I have addad my application in Google App Engine, localy image upload is working well but when update app engine online, it shows this error after submit of image:

Symfony \ Component \ Debug \ Exception \ FatalErrorException Call to a member function getClientOriginalExtension() on a non-object

CarController.php

public function upload_image($id) {

            $file = Input::file('image');
            $destinationPath = 'uploads/images/';
            $extension = $file->getClientOriginalExtension();

            $filename = time() . '' . str_random(6) . '.' . $extension;

            $file->move($destinationPath, $filename);


    }

routes.php

Route::post('upload/image/{id}', array('as' => 'upload.image', 'uses' => 'CarController@upload_image'));

upload_images.blade.php

 {{ Form::file('image') }}
            <br>
            {{ Form::submit('Add Photo', array('class' => 'btn btn-primary' )) }}
            {{ Form::close() }}

and when update my applicaion by cp it shows this : Could not guess mimetype for public/uploads/images/1400508710-png. Using applic ation/octet-stream. Could not guess mimetype for public/uploads/images/1400509034-png. Using applic ation/octet-stream.

app.yaml

application: national-test
version: 1
runtime: php
api_version: 1

handlers:
- url: /favicon\.ico
  static_files: favicon.ico
  upload: favicon\.ico

- url: /(.+.(css|js|less|ico|png|jpg|woff|ttf|gif))$ 
  static_files: \1 
  upload: .+.(css|js|less|ico|png|jpg|woff|ttf|gif)$ 
  application_readable: true

- url: /.*
  script: public/index.php

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