Codeigniter，GroceryCRUD，GoDaddy-文件上传错误

我在CI中有一个控制器，它允许我将文件上传到数据库。它在本地运行良好。我在GoDaddy上设置了CI，更改了权限，更改了数据库配置等。

现在，当我尝试上传一个文件时，我可以选择该文件，它会100%上传——但它不会保存。上传到的目录文件的权限为777（目前正在测试）。我在webdev控制台中得到以下内容：

Error in event handler for (unknown): TypeError: Cannot read property 'state' of null
    at CSRecorder.onQueryStateCompleted (chrome-extension://cplklnmnlbnpmjogncfgfijoopmnlemp/content_scripts/recorder.js:45:13)
    at extensions::messaging:327:9
    at Function.target.(anonymous function) (extensions::SafeBuiltins:19:14)
    at Event.dispatchToListener (extensions::event_bindings:386:22)
    at Event.dispatch_ (extensions::event_bindings:371:27)
    at Event.dispatch (extensions::event_bindings:392:17)
    at dispatchOnMessage (extensions::messaging:294:22) extensions::event_bindings:375
GET http://mywebsite.com/index.php/assets/uploads/files/dark_bg.png 404 (Not Found) jquery-1.10.2.min.js:4
event.returnValue is deprecated. Please use the standard event.preventDefault() instead. 

我还收到一个弹出窗口，上面写着"The page at mywebsite.com says: 6"。

这是控制器（同样，它在我的本地Windows机器上工作）：

public function photo_upload()
    {
        try{
            $gc = new grocery_CRUD;
            $gc->set_table('photography')
                ->set_subject('Image')
                ->required_fields('image_path')
                ->columns('image_path','image_name');
            $gc->set_field_upload('image_path','assets/uploads/files');
            $gc->unset_fields(array('image_date','image_extension'));
            $gc->change_field_type('image_name','invisible');
            $gc->callback_before_insert(array($this,'rename_image'));
            $output = $gc->render();
            $this->_example_output($output); 
        }catch(Exception $e){
                show_error($e->getMessage().' --- '.$e->getTraceAsString());
            }       
    }
function rename_image($post_array) 
    {
        if (!empty($post_array)) {
            //Remove image extension from image name
            $img_name = preg_replace('/'.[^.]+$/', '', $post_array['image_path']);
            //Remove codeigniter id from image name
            $img_name = substr($img_name, 6);
            $post_array['image_name'] = $img_name;
            return $post_array;
        }
    }