angularjs-typescript-webpack-seed doesn't run

I downloaded this boilerplate and I'm trying to run it, but when I go "npm run dev" I get the following error:

TypeError: webpack.validateSchema is not a function at new Server (/home/node/angularjs-typescript-webpack-seed-master/node_modules/webpack-dev-server/lib/Server.js:25:35) at startDevServer (/home/node/angularjs-typescript-webpack-seed-master/node_modules/webpack-dev-server/bin/webpack-dev-server.js:358:12) at /home/node/angularjs-typescript-webpack-seed-master/node_modules/webpack-dev-server/bin/webpack-dev-server.js:330:3 at /home/node/angularjs-typescript-webpack-seed-master/node_modules/portfinder/lib/portfinder.js:160:14 at /home/node/angularjs-typescript-webpack-seed-master/node_modules/async/lib/async.js:52:16 at /home/node/angularjs-typescript-webpack-seed-master/node_modules/async/lib/async.js:269:32 at /home/node/angularjs-typescript-webpack-seed-master/node_modules/async/lib/async.js:44:16 at /home/node/angularjs-typescript-webpack-seed-master/node_modules/portfinder/lib/portfinder.js:122:16 at Server.onListen (/home/node/angularjs-typescript-webpack-seed-master/node_modules/portfinder/lib/portfinder.js:45:7) at Server.g (events.js:291:16) at emitNone (events.js:86:13) at Server.emit (events.js:185:7) at emitListeningNT (net.js:1285:10) at _combinedTickCallback (internal/process/next_tick.js:71:11) at process._tickCallback (internal/process/next_tick.js:98:9) at Module.runMain (module.js:606:11)

BTW I didn't install the webpack dev server globally as instructed in the repository, but locally, because I had gotten an error while trying to globally install.

You can see the entire code here.

Any help will be profoundly appreciated!

via Alon