There's no networks to select under "Primary interface", when attempting to provision a new OpenStack instance.

Attempting to spawn results in an error:

GUI:

Warning!
can't convert nil into String

If you feel this is an error with Foreman itself, please open a new issue with Foreman ticketing system, You would probably need to attach the Full trace and relevant log entries.
TypeError
can't convert nil into String
app/models/compute_resource.rb:121:in `new_vm'
app/models/concerns/orchestration/compute.rb:24:in `compute_object'
app/views/hosts/_compute.html.erb:1:in `_26aafaf50fd5f274b07083f6f00a3975'
app/views/hosts/_unattended.html.erb:2:in `_f62bd0b0816b06f1bc619274fb75c26c'
app/views/hosts/_form.html.erb:92:in `block (2 levels) in _136dcf5b6e41a2dda16265f20e4000c7'
app/helpers/layout_helper.rb:250:in `form_for'
app/views/hosts/_form.html.erb:8:in `block in _136dcf5b6e41a2dda16265f20e4000c7'
app/models/taxonomy.rb:48:in `block (2 levels) in as_taxonomy'
app/models/concerns/foreman/thread_session.rb:143:in `as_location'
app/models/taxonomy.rb:47:in `block in as_taxonomy'
app/models/concerns/foreman/thread_session.rb:108:in `as_org'
app/models/taxonomy.rb:46:in `as_taxonomy'
app/views/hosts/_form.html.erb:6:in `_136dcf5b6e41a2dda16265f20e4000c7'
app/views/hosts/new.html.erb:7:in `_af9ce75a8385011c5b66b1947751ea27'
app/controllers/application_controller.rb:287:in `process_error'
app/controllers/hosts_controller.rb:95:in `create'
app/models/concerns/foreman/thread_session.rb:33:in `clear_thread'
lib/middleware/catch_json_parse_errors.rb:9:in `call' 

production.log

failed to create vm: Multiple possible networks found, use a Network ID to be more specific.
Failed to create a compute OpenStack (OpenStack) instance openstacktest.domain.com: Multiple possible networks found, use a Network ID to be more specific.
 /usr/share/foreman/app/models/compute_resources/foreman/model/openstack.rb:64:in `rescue in create_vm'
/usr/share/foreman/app/models/compute_resources/foreman/model/openstack.rb:53:in `create_vm'
/usr/share/foreman/app/models/concerns/orchestration/compute.rb:74:in `setCompute'
/usr/share/foreman/app/models/concerns/orchestration.rb:137:in `execute'
/usr/share/foreman/app/models/concerns/orchestration.rb:85:in `block in process'
/usr/share/foreman/app/models/concerns/orchestration.rb:77:in `each'
/usr/share/foreman/app/models/concerns/orchestration.rb:77:in `process'
/usr/share/foreman/app/models/concerns/orchestration.rb:18:in `on_save'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:649:in `_run__366134935505093957__save__2728567077743696852__callbacks'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:405:in `__run_callback'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:385:in `_run_save_callbacks'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:81:in `run_callbacks'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/callbacks.rb:264:in `create_or_update'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/persistence.rb:84:in `save'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/validations.rb:50:in `save'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/attribute_methods/dirty.rb:22:in `save'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/transactions.rb:259:in `block (2 levels) in save'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/transactions.rb:313:in `block in with_transaction_returning_status'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/transactions.rb:208:in `transaction'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/transactions.rb:311:in `with_transaction_returning_status'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/transactions.rb:259:in `block in save'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/transactions.rb:270:in `rollback_active_record_state!'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/transactions.rb:258:in `save'
/usr/share/foreman/app/models/concerns/foreman/sti.rb:29:in `save_with_type'
/usr/share/foreman/app/controllers/hosts_controller.rb:90:in `create'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/abstract_controller/base.rb:167:in `process_action'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_controller/metal/rendering.rb:10:in `process_action'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/abstract_controller/callbacks.rb:18:in `block in process_action'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:527:in `block (3 levels) in _run__1060686064760951973__process_action__2712728338828644856__callbacks'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:215:in `block in _conditional_callback_around_6422'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:326:in `around'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:310:in `_callback_around_1584'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:214:in `_conditional_callback_around_6422'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:526:in `block (2 levels) in _run__1060686064760951973__process_action__2712728338828644856__callbacks'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:215:in `block in _conditional_callback_around_6421'
/usr/share/foreman/app/models/concerns/foreman/thread_session.rb:33:in `clear_thread'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:214:in `_conditional_callback_around_6421'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:415:in `block in _run__1060686064760951973__process_action__2712728338828644856__callbacks'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:215:in `block in _conditional_callback_around_6420'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:326:in `around'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:310:in `_callback_around_13'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:214:in `_conditional_callback_around_6420'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:414:in `_run__1060686064760951973__process_action__2712728338828644856__callbacks'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:405:in `__run_callback'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:81:in `run_callbacks'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/abstract_controller/callbacks.rb:17:in `process_action'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_controller/metal/rescue.rb:29:in `process_action'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/notifications.rb:123:in `block in instrument'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/notifications.rb:123:in `instrument'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_controller/metal/instrumentation.rb:29:in `process_action'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/railties/controller_runtime.rb:18:in `process_action'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/abstract_controller/base.rb:121:in `process'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/abstract_controller/rendering.rb:45:in `process'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_controller/metal.rb:203:in `dispatch'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_controller/metal.rb:246:in `block in action'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/routing/route_set.rb:73:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/routing/route_set.rb:36:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/journey-1.0.4/lib/journey/router.rb:68:in `block in call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/journey-1.0.4/lib/journey/router.rb:56:in `each'
/usr/share/foreman/vendor/ruby/1.9.1/gems/journey-1.0.4/lib/journey/router.rb:56:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/routing/route_set.rb:608:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/apipie-rails-0.1.3/lib/apipie/static_dispatcher.rb:65:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/apipie-rails-0.1.3/lib/apipie/middleware/checksum_in_headers.rb:27:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-1.4.5/lib/rack/etag.rb:23:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-1.4.5/lib/rack/conditionalget.rb:35:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/middleware/head.rb:14:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/middleware/params_parser.rb:21:in `call'
/usr/share/foreman/lib/middleware/catch_json_parse_errors.rb:9:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/middleware/flash.rb:242:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-1.4.5/lib/rack/session/abstract/id.rb:210:in `context'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-1.4.5/lib/rack/session/abstract/id.rb:205:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/middleware/cookies.rb:341:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/query_cache.rb:64:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activerecord-3.2.18/lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:405:in `_run__1525993612035357477__call__2728567077743696852__callbacks'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:405:in `__run_callback'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/callbacks.rb:81:in `run_callbacks'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/middleware/callbacks.rb:27:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/railties-3.2.18/lib/rails/rack/logger.rb:32:in `call_app'
/usr/share/foreman/vendor/ruby/1.9.1/gems/railties-3.2.18/lib/rails/rack/logger.rb:16:in `block in call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/tagged_logging.rb:22:in `tagged'
/usr/share/foreman/vendor/ruby/1.9.1/gems/railties-3.2.18/lib/rails/rack/logger.rb:16:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/middleware/request_id.rb:22:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-1.4.5/lib/rack/methodoverride.rb:21:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-1.4.5/lib/rack/runtime.rb:17:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/activesupport-3.2.18/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-1.4.5/lib/rack/lock.rb:15:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/actionpack-3.2.18/lib/action_dispatch/middleware/static.rb:63:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:136:in `forward'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:143:in `pass'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:155:in `invalidate'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:71:in `call!'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/railties-3.2.18/lib/rails/engine.rb:484:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/railties-3.2.18/lib/rails/application.rb:231:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/railties-3.2.18/lib/rails/railtie/configurable.rb:30:in `method_missing'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-1.4.5/lib/rack/builder.rb:134:in `call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-1.4.5/lib/rack/urlmap.rb:64:in `block in call'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-1.4.5/lib/rack/urlmap.rb:49:in `each'
/usr/share/foreman/vendor/ruby/1.9.1/gems/rack-1.4.5/lib/rack/urlmap.rb:49:in `call'
/usr/lib/ruby/vendor_ruby/phusion_passenger/rack/thread_handler_extension.rb:77:in `process_request'
/usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:142:in `accept_and_process_next_request'
/usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:110:in `main_loop'
/usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler.rb:448:in `block (3 levels) in start_threads'
Rolling back due to a problem: [Set up compute instance openstacktest.domain.com  2       failed  [#<Host::Managed id: nil, name: "openstacktest.domain.com", ip: nil, last_compile: nil, last_freshcheck: nil, last_report: nil, updated_at: nil, source_file_id: nil, created_at: nil, mac: nil, root_pass: "$1$9r7Rs0GY$T0fLSbY8YHMMuTGBbLdqT0", serial: nil, puppet_status: 0, domain_id: 1, architecture_id: 1, operatingsystem_id: 1, environment_id: 1, subnet_id: nil, ptable_id: nil, medium_id: nil, build: true, comment: "", disk: "", installed_at: nil, model_id: nil, hostgroup_id: 5, owner_id: 2, owner_type: "User", enabled: true, puppet_ca_proxy_id: 1, managed: true, use_image: nil, image_file: nil, uuid: nil, compute_resource_id: 2, puppet_proxy_id: 1, certname: nil, image_id: 1, organization_id: nil, location_id: nil, type: "Host::Managed", otp: nil, realm_id: nil, compute_profile_id: 6, provision_method: "image">, :setCompute]]
Remove puppet certificate for openstacktest.domain.com
Started GET "/tasks/d33ddf61-a48a-418d-af6f-29faf451722e" for 10.0.0.10 at 2014-07-01 10:41:40 +0200
Processing by TasksController#show as */*
  Parameters: {"id"=>"d33ddf61-a48a-418d-af6f-29faf451722e"}
  Rendered tasks/_list.html.erb (1.1ms)
Completed 200 OK in 4.3ms (Views: 1.9ms | ActiveRecord: 0.3ms)
Started GET "/tasks/d33ddf61-a48a-418d-af6f-29faf451722e" for 10.0.0.10 at 2014-07-01 10:41:41 +0200
Processing by TasksController#show as */*
  Parameters: {"id"=>"d33ddf61-a48a-418d-af6f-29faf451722e"}
  Rendered tasks/_list.html.erb (0.6ms)
Completed 200 OK in 3.4ms (Views: 1.1ms | ActiveRecord: 0.4ms)
Delete the autosign entry for openstacktest.domain.com
Failed to save: Failed to create a compute OpenStack (OpenStack) instance openstacktest.domain.com: Multiple possible networks found, use a Network ID to be more specific.

  Rendered hosts/_progress.html.erb (0.8ms)
  Rendered puppetclasses/_selectedClasses.html.erb (0.0ms)
  Rendered puppetclasses/_classes_in_groups.html.erb (0.0ms)
  Rendered puppetclasses/_classes.html.erb (462.1ms)
  Rendered puppetclasses/_class_selection.html.erb (579.3ms)
Successfully decrypted field for Foreman::Model::Openstack OpenStack
  Rendered hosts/_compute.html.erb (7.3ms)
  Rendered hosts/_unattended.html.erb (9.6ms)
  Rendered hosts/_form.html.erb (821.7ms)
  Rendered hosts/new.html.erb within layouts/application (823.5ms)
Operation FAILED: can't convert nil into String
  Rendered common/500.html.erb (6.7ms)
Completed 500 Internal Server Error in 9869.4ms (Views: 7.8ms | ActiveRecord: 32.4ms)