SSR Not Working

[JegatheeshSelvam]

After run comment:- npm run server

below message showing in the command prompt:-

react-native-web-ssr-boilerplate@0.1.0 server
npm run warn-art && node ./main.js

react-native-web-ssr-boilerplate@0.1.0 warn-art
echo '

To fix [document is not defined], it needs this change: sebmarkbage/art#16
------'

'
[webpack-isomorphic-tools] (waiting for the first Webpack build to finish)
[webpack-isomorphic-tools] (waiting for the first Webpack build to finish)
[webpack-isomorphic-tools] (waiting for the first Webpack build to finish)
[webpack-isomorphic-tools] (waiting for the first Webpack build to finish)
[webpack-isomorphic-tools] (waiting for the first Webpack build to finish)

waiting more than 1 hour not execute the next line.

Please help me.