NO NETBEANS PROJECTS ADDED warning

Question

I am trying to import a projetc (in ZIP file) in my netbeans. It is downloaded from GitHub (link: https://github.com/varavell/OnlineBookStore). While importing the project from Zip it shows the error and no project becomes imported. At the same time, at the bottom right corner it keeps unpacking of the project (never finish it though). Why this happening and how can I run a complete project into netbeans?

The worning is:

Solution

This warning (No NetBeans projects added) can happen if the zip file was created manually. To avoid this create the ZIP file in NetBeans using File > Export Project > To Zip...