Issue in qqfileuploader


I have a issue in qqfileuploader. When i am trying to upload image then get error:

NetworkError: 500 Internal Server Error

I am using below code…I already set csrf token in request but still get error… **function createUploader(){
var uploader = new qq.FileUploader({ element: document.getElementById(‘file-uploader’), action: ‘uploadimage’, params: { authenticity_token: $(‘meta[name=csrf-token]’).attr(‘content’) },
allowedExtensions: [‘png’, ‘gif’, ‘jpg’, ‘jpeg’], multiple: false });

// in your app create uploader as soon as the DOM is ready
// don't wait for the window to load 
window.onload = createUploader;**

If any have a solutions then please send me asap. Thanks.