Yast control center is working, but no yast module is loading.

I see this in y2log:

2015-11-13 08:47:11 <1> linux-izwb(9294) [liby2] genericfrontend.cc(main):617
Launched YaST2 component 'y2base' 'sw_single' 'ncurses'
2015-11-13 08:47:11 <1> linux-izwb(9294) [ui-component]
YUIComponentCreator.cc(createInternal):124 Creating UI component for ""
2015-11-13 08:47:11 <1> linux-izwb(9294) [liby2] genericfrontend.cc(main):806
YAST_IS_RUNNING is yes
2015-11-13 08:47:11 <3> linux-izwb(9294) [Y2Ruby]
binary/Y2RubyUtils.cc(y2_require):25 cannot require yast:cannot load such file
-- fast_gettext at /usr/lib64/ruby/vendor_ruby/2.1.0/yast/i18n.rb:1:in
`require'
2015-11-13 08:47:11 <1> linux-izwb(9294) [liby2] genericfrontend.cc(main):820
Finished YaST2 component 'y2base'
2015-11-13 08:47:11 <1> linux-izwb(9294) [liby2] genericfrontend.cc(main):825
Exiting with client return value 'false'


ruby2.1-rubygem-fast_gettext is installed, even from openSUSE repository.

However, its is worth to mention that I added also OBS:Server:Unstable
repository
which is also providing rubygems. OBS itself only requires ruby2.2 ones, but
the ruby2.1 ones are available there as well.

The default ruby is also still 2.1 on my installation.

Tell what else you need or if I should stop in any office with my notebook :)