Begin of the insertionAfter updating from version 6.0.3 to 6.0.4 the installation failed and the OpenProject did’t work anymore\!

I’m using Ubuntu 14.04 Server:

root@OpenProjectServer:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty

root@OpenProjectServer:~# openproject configure >> /tmp/openproject.log
Selected addons: legacy-installer mysql apache2 repositories smtp memcached openproject
[legacy-installer] ./bin/configure
[mysql] ./bin/configure
[apache2] ./bin/configure
[repositories] ./bin/configure
[smtp] ./bin/configure
[memcached] ./bin/configure
[openproject] ./bin/configure
[legacy-installer] ./bin/preinstall
[mysql] ./bin/preinstall
[apache2] ./bin/preinstall
[repositories] ./bin/preinstall
[smtp] ./bin/preinstall
[memcached] ./bin/preinstall
[openproject] ./bin/preinstall
[legacy-installer] ./bin/postinstall
[mysql] ./bin/postinstall
[apache2] ./bin/postinstall
[repositories] ./bin/postinstall
[smtp] ./bin/postinstall
[memcached] ./bin/postinstall
[openproject] ./bin/postinstall
$(npm bin)/webpack --config webpack.production.config.js
ts-loader: Using typescript@1.7.5 and /opt/openproject/frontend/tsconfig.json

From the log:

...
WARNING in Cannot find module 'amdefine'
@ ./components ^((?!\.(test|spec)).)*\.(js|ts|html)$

WARNING in Cannot find module 'amdefine'
@ ./components ^((?!\.(test|spec)).)*\.(js|ts|html)$

ERROR in Cannot find module 'amdefine'
@ ./init-app.js 155:0-87
Child extract-text-webpack-plugin:
+ 2 hidden modules
Child extract-text-webpack-plugin:
+ 2 hidden modules
...End of the insertion