find a error when build mediasoup-demo

I pull newest mediasoup-demo from github and deployed it on my host, but when I build the client in app dir using ‘gulp dist’, I get a error , the error message is " error Unexpected use of file extension “json” for “./package.json” import/extensions". I dont understand why

Now, I have konwed why gulp report this error. Shuold modify gulpfile.js file from “require(’./packet.json’)” to “require(’./packet’)”