can anyone help for the data collection problem. maybe the sandbox sever down (www.inrexea.com)
This post is not possible to help you with. There is not enough information to help you. The link you have provided works great and the subject of the post says backend problem but you don't show any backend function or code.
Please read the Forum Recommendations and edit your post so it is clear what you need help with and I will try helping you.