npm start is not work

After 
`npm install `
I see these
<pre>
added 1200 packages from 698 contributors and audited 17107 packages in 1637.936s
found 308 vulnerabilities (99 low, 84 moderate, 124 high, 1 critical)
  run `npm audit fix` to fix them, or `npm audit` for details
</pre>
I guess it is not ok because further steps is not work
