Pixel streaming custom HTML not loaded

I also tried the Pixel Streaming Demo and I get the default PS page with the video stream if I go to “localhost” in my web browser. If I follow the linked page’s instructions and go to “localhost/PixelDemo.htm” then I get the customized web page but no video stream. The console shows two errors:

Failed to load resource: the server responded with a status of 404 (Not Found)

Uncaught TypeError: Cannot set property 'className' of null