RuntimeError after the command "rails new testapp"

After i executed the command "rails new testapp" the commandline shows me this: C:\Users\Aykut Özdemir\Documents>rails new testapp create create README.rdoc create Rakefile create config.ru create .gitignore create Gemfile create app create app/assets/javascripts/application.js create app/assets/stylesheets/application.css create app/controllers/application_controller.rb create app/helpers/application_helper.rb create app/views/layouts/application.html.erb create app/assets/images/.keep create app/mailers/.keep create app/models/.keep create app/controllers/concerns/.keep create app/models/concerns/.keep create bin create bin/bundle create bin/rails create bin/rake create bin/setup create config create config/routes.rb create config/application.rb create config/environment.rb create config/secrets.yml create config/environments create config/environments/development.rb create config/environments/production.rb create config/environments/test.rb create config/initializers create config/initializers/assets.rb create config/initializers/backtrace_silencers.rb create config/initializers/cookies_serializer.rb create config/initializers/filter_parameter_logging.rb create config/initializers/inflections.rb create config/initializers/mime_types.rb create config/initializers/session_store.rb create config/initializers/wrap_parameters.rb create config/locales create config/locales/en.yml create config/boot.rb create config/database.yml create db create db/seeds.rb create lib create lib/tasks create lib/tasks/.keep create lib/assets create lib/assets/.keep create log create log/.keep create public create public/404.html create public/422.html create public/500.html create public/favicon.ico create public/robots.txt create test/fixtures create test/fixtures/.keep create test/controllers create test/controllers/.keep create test/mailers create test/mailers/.keep create test/models create test/models/.keep create test/helpers create test/helpers/.keep create test/integration create test/integration/.keep create test/test_helper.rb create tmp/cache create tmp/cache/assets create vendor/assets/javascripts create vendor/assets/javascripts/.keep create vendor/assets/stylesheets create vendor/assets/stylesheets/.keep run bundle install C:/Ruby22-x64/lib/ruby/site_ruby/2.2.0/rbreadline.rb:1097:in `<module:RbReadline

': HOME environment variable (or HOMEDRIVE and HOMEPATH) must be set and point to a directory (RuntimeError) from C:/Ruby22-x64/lib/ruby/site_ruby/2.2.0/rbreadline.rb:17:in <top (r equired)>' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :inrequire' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :in require' from C:/Ruby22-x64/lib/ruby/site_ruby/2.2.0/readline.rb:10:in<module:R eadline>' from C:/Ruby22-x64/lib/ruby/site_ruby/2.2.0/readline.rb:8:in <top (requ ired)>' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :inrequire' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :in require' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/lib/bundler/ve ndor/thor/line_editor/readline.rb:2:in<top (required)>' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :in require' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :inrequire' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/lib/bundler/ve ndor/thor/line_editor.rb:2:in <top (required)>' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :inrequire' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :in require' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/lib/bundler/ve ndor/thor/base.rb:8:in<top (required)>' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :in require' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :inrequire' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/lib/bundler/ve ndor/thor.rb:2:in <top (required)>' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :inrequire' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :in require' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/lib/bundler/ve ndored_thor.rb:7:in<top (required)>' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :in require' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :inrequire' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/lib/bundler/fr iendly_errors.rb:2:in <top (required)>' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :inrequire' from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54 :in require' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.8.5/bin/bundle:17: in<main>'

C:\Users\Aykut Özdemir\Documents>

Why is there a RuntimeError?

Also if i want to connect to the server the commandline says that he couldnt find the Gemfile:

C:\Users\Aykut Özdemir\Documents>cd testapp

C:\Users\Aykut Özdemir\Documents\testapp>rails s C:/Users/Aykut Ã?zdemir/Documents/testapp/Gemfile not found

C:\Users\Aykut Özdemir\Documents\testapp>

Can anybody help me?