Npm install -- Throws be python error about isomorphic500

[ShunmugamAiyappan]

I have change the node-sass version, now its working

[ShunmugamAiyappan]

Failed to set error notification.
E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\webpack-dev-server\lib\Server.js:29
const validationErrors = webpack.validateSchema(optionsSchema, options);
^

TypeError: webpack.validateSchema is not a function
at new Server (E:\Projects\FrontEnd\Incentivio\isomorphic500\node_modules\webpack-dev-server\lib\Server.js:29:35)
at exports.default (E:/Projects/FrontEnd/Incentivio/isomorphic500/webpack/server.js:24:28)
at E:\Projects\FrontEnd\Incentivio\isomorphic500\index.js:16:32
at Server. (E:/Projects/FrontEnd/Incentivio/isomorphic500/src/server.js:81:50)
at Server.g (events.js:292:16)
at emitNone (events.js:86:13)
at Server.emit (events.js:185:7)
at emitListeningNT (net.js:1284:10)
at _combinedTickCallback (internal/process/next_tick.js:77:11)
at process._tickCallback (internal/process/next_tick.js:104:9)
31 Aug 10:04:21 - [nodemon] app crashed - waiting for file changes before starting...