Ionic 2 starting error!

hj all!

I downloaded an ionic 2 project. I discovered is nonexistent index.html file in the directory www. on the contrary index.html file located in src forder.

So how to run my project?
I did the following:
step 1: cd ionic-conference-app
Step 2: ionic serve

it seems wrong! -> “Index.html file not found” in the www

" Error: ENOENT: no such file or directory, open 'C:\Users\Administrator\ionic-conference-app-master\www\index.htm "

help me!

Did you run npm install as mentioned here?