Electron didn't launch anything when i ran npm start


today, tried to use electron. I followed instruction here: https://electronjs.org/docs/tutorial/first-app . I followed all step, but when i typed npm start on my command prompt and ran it, electron didn’t launch anything. It didn’t show any error too. Is there anybody know how to solve this problem?

i use windows 10
my node js version is v11.0.0
my npm version is 6.4.1