I cannot make much sense from this error message. Maybe you can point me in a direction.
It’s a virtual machine using Debian 7 and ruby 2.2.2.
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[openproject] ./bin/configure
[legacy-installer] ./bin/preinstall
[mysql] ./bin/preinstall
[apache2] ./bin/preinstall
[svn-dav] ./bin/preinstall
[smtp] ./bin/preinstall
[memcached] ./bin/preinstall
No memcached server to install. Skipping.
[openproject] ./bin/preinstall
[legacy-installer] ./bin/postinstall
[mysql] ./bin/postinstall
Generating /etc/openproject-ce/conf.d/database…
[apache2] ./bin/postinstall
[svn-dav] ./bin/postinstall
[smtp] ./bin/postinstall
[memcached] ./bin/postinstall
[openproject] ./bin/postinstall
require ‘rails/all’… 0.460s
Bundler.require… 1.260s
rake aborted!
Psych::SyntaxError: (): found character that cannot start any token while scanning for the next token at line 10 column 18
/home/opt/openproject-ce/lib/open_project/configuration.rb:158:in `load_config_from_file’
/home/opt/openproject-ce/lib/open_project/configuration.rb:90:in `load’
/home/opt/openproject-ce/lib/open_project/configuration.rb:115:in `[]’
/home/opt/openproject-ce/config/application.rb:166:in `class:Application’
/home/opt/openproject-ce/config/application.rb:75:in `module:OpenProject’
/home/opt/openproject-ce/config/application.rb:74:in `<top (required)>’
/home/opt/openproject-ce/Rakefile:33:in `require’
/home/opt/openproject-ce/Rakefile:33:in `<top (required)>’
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edit: updated error message