validateSchema is not a function

[JEricFarias]

Can you help me figure out what I am doing wrong? I just cloned your code and run npm install.

I first try to run your code with npx but I'm getting this error.

I'm sure that '6to5' package is already installed. So I install webpack on global but when I try to run they send me that message on the tittle "validateSchema is not a function". I search in every file for this "function" but I don't find it.

Once webpack is getting this error I tried to run gulp

with npx and gulp send this same error message.

Am I doing something wrong?