Hi,
I was facing the same problem after installing npm, but then I tried different Apache server rather than Node.js, try out with XAMPP,since it has more features compared to node.js. #here are the steps you should do,
– Install XAMPP on your pc.
– put your Cesium directory into the htdocs folder of XAMPP directory.(in case of windows OS ,this folder will be named as ’ www '.
– start apache,mysql,and proftpd services from xampp.
– run localhost/Path/to/your/Cesium/directory(basically path will be like [ localhost/(path to your xampp directory)/htdocs/Cesium].