sinatra-1.2.2 is not supported by mongo3 or connection configuration is not correct?

[developerworks]

Command line for start mongo3 and "mongo://192.168.1.105:50000/mongo3/sessions" is connected.

mongo3 --pool "mongo://192.168.1.105:50000/mongo3/sessions" --environment=master

Environment settings in landscapge.yml:

master:
  host: 192.168.1.105
  port: 50000

Do request "http://192.168.91.128:6663/" from browser.

Errors occured like the following:

RuntimeError - MongoDB connection failed for `"host":"port" with Failed to connect to a master node at host:0:
 /var/lib/gems/1.8/gems/mongo3-0.1.3/lib/mongo3/connection.rb:431:in `connect_for'
 /var/lib/gems/1.8/gems/mongo3-0.1.3/lib/mongo3/connection.rb:250:in `slave?'
 /var/lib/gems/1.8/gems/mongo3-0.1.3/lib/mongo3/connection.rb:227:in `build_tree'
 /var/lib/gems/1.8/gems/mongo3-0.1.3/lib/mongo3/connection.rb:219:in `each_pair'
 /var/lib/gems/1.8/gems/mongo3-0.1.3/lib/mongo3/connection.rb:219:in `build_tree'
 /var/lib/gems/1.8/gems/mongo3-0.1.3/lib/controllers/explore.rb:22:in `GET /'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:1162:in `call'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:1162:in `compile!'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:736:in `instance_eval'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:736:in `route_eval'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:720:in `route!'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:770:in `process_route'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:767:in `catch'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:767:in `process_route'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:719:in `route!'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:718:in `each'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:718:in `route!'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:855:in `dispatch!'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:646:in `call!'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:820:in `instance_eval'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:820:in `invoke'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:820:in `catch'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:820:in `invoke'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:646:in `call!'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:631:in `call'
 /var/lib/gems/1.8/gems/rack-1.2.1/lib/rack/session/abstract/id.rb:63:in `context'
 /var/lib/gems/1.8/gems/rack-1.2.1/lib/rack/session/abstract/id.rb:58:in `call'
 /var/lib/gems/1.8/gems/rack-1.2.1/lib/rack/commonlogger.rb:18:in `call'
 /var/lib/gems/1.8/gems/rack-1.2.1/lib/rack/methodoverride.rb:24:in `call'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:1282:in `call'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:1313:in `synchronize'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:1282:in `call'
 /var/lib/gems/1.8/gems/rack-1.2.1/lib/rack/content_length.rb:13:in `call'
 /var/lib/gems/1.8/gems/rack-1.2.1/lib/rack/handler/webrick.rb:52:in `service'
 /usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
 /usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
 /usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
 /usr/lib/ruby/1.8/webrick/server.rb:162:in `start'
 /usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
 /usr/lib/ruby/1.8/webrick/server.rb:95:in `start'
 /usr/lib/ruby/1.8/webrick/server.rb:92:in `each'
 /usr/lib/ruby/1.8/webrick/server.rb:92:in `start'
 /usr/lib/ruby/1.8/webrick/server.rb:23:in `start'
 /usr/lib/ruby/1.8/webrick/server.rb:82:in `start'
 /var/lib/gems/1.8/gems/rack-1.2.1/lib/rack/handler/webrick.rb:13:in `run'
 /var/lib/gems/1.8/gems/sinatra-1.2.2/lib/sinatra/base.rb:1245:in `run!'
 /var/lib/gems/1.8/gems/mongo3-0.1.3/bin/mongo3:45:in `run!'
 /var/lib/gems/1.8/gems/main-4.4.0/lib/main/program/class_methods.rb:155:in `run'
 /var/lib/gems/1.8/gems/main-4.4.0/lib/main/program/class_methods.rb:144:in `catch'
 /var/lib/gems/1.8/gems/main-4.4.0/lib/main/program/class_methods.rb:144:in `run'
 /var/lib/gems/1.8/gems/main-4.4.0/lib/main/factories.rb:18:in `run'
 /var/lib/gems/1.8/gems/main-4.4.0/lib/main/factories.rb:25:in `Main'
 /var/lib/gems/1.8/gems/mongo3-0.1.3/bin/mongo3:7
 /var/lib/gems/1.8/bin/mongo3:19:in `load'
 /var/lib/gems/1.8/bin/mongo3:19

How to configure the "host":"port" parameter in the first line of these error messages.