CKEditor Image Browser plugin

error msg:

HTTP Status: 404/Not Found: "images_list.json"

open browser on url:

http://localhost:51726/SP-S-ZIMZUMIM/test/renderHTML/edit/lib/ckeditor/plugins/imagebrowser/browser/browser.html?listUrl=images_list.json&CKEditor=editor1&CKEditorFuncNum=1&langCode=en

// this is working
                        //$cms.ckeditor();

                        $cms.ckeditor(
                            {
                            "extraPlugins": "imagebrowser",
                            "imageBrowser_listUrl": "images_list.json"
                        });

the path is relative to the page having the editor..

its a .txt file that i gange the extantion to .json 

what i ding wrong?