Error: only one instance of babel-polyfill is allowed

[Wolke]

I use react-router and parse-server together.
and still get this:

/Users/chienhunglin/Dropbox/1797parseserver/node_modules/babel-polyfill/lib/index.js:14
throw new Error("only one instance of babel-polyfill is allowed");
^

Error: only one instance of babel-polyfill is allowed
at Object. (/Users/chienhunglin/Dropbox/1797parseserver/node_modules/babel-polyfill/lib/index.js:14:9)

shakacode/bootstrap-loader#16 <=this is solution, can everyone to add this on project
thx