Thank you - it's working!
I suggest to edit the examples (4.3.2 Hostname patterns) in 
https://theforeman.org/plugins/foreman_discovery/8.0/index.html

On Sunday, June 4, 2017 at 8:45:17 PM UTC+3, Ido Kaplan wrote:
>
> Hi,
>
> Foreman 1.14.3
> Foreman Discovery 8.01
>
> When I try to create a discovery rule with this hostname patttern -
> load-balancer-<%= @host.facts['bios_vendor'] + '-' + rand(99999) %>
> I get an error.
>
> 2017-06-04 20:22:34 bdcaf224 [app] [I] Started POST 
> "/discovered_hosts/mac000000000000/auto_provision" for 10.20.10.4 at 
> 2017-06-04 20:22:34 +0300
> 2017-06-04 20:22:34 bdcaf224 [app] [I] Processing by 
> DiscoveredHostsController#auto_provision as HTML
> 2017-06-04 20:22:34 bdcaf224 [app] [I]   Parameters: 
> {"authenticity_token"=>"XXXXXXXXXXXXX=", "id"=>"mac000000000000"}
> 2017-06-04 20:22:34 bdcaf224 [app] [I] Match found for host 
> mac000000000000 (45) rule Test (1)
> 2017-06-04 20:22:34 bdcaf224 [templates] [I] Rendering template 'Unnamed'
> 2017-06-04 20:22:34 bdcaf224 [app] [W] Action failed
>  | TypeError: no implicit conversion of Fixnum into String
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/safemode-1.2.4/lib/safemode/jail.rb:25:in
>  
> `+'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/safemode-1.2.4/lib/safemode/jail.rb:25:in
>  
> `method_missing'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/safemode-1.2.4/lib/safemode.rb:53:in
>  
> `bind'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/safemode-1.2.4/lib/safemode.rb:51:in
>  
> `eval'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/safemode-1.2.4/lib/safemode.rb:51:in
>  
> `eval'
>  | /usr/share/foreman/lib/foreman/renderer.rb:32:in `render_safe'
>  | /usr/share/foreman/lib/foreman/renderer.rb:161:in `unattended_render'
>  | /usr/share/foreman/app/models/host/managed.rb:814:in `render_template'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/foreman_discovery-8.0.1/app/controllers/concerns/foreman/controller/discovered_extensions.rb:54:in
>  
> `perform_auto_provision'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/foreman_discovery-8.0.1/app/controllers/discovered_hosts_controller.rb:161:in
>  
> `auto_provision'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_controller/metal/implicit_render.rb:4:in
>  
> `send_action'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/abstract_controller/base.rb:198:in
>  
> `process_action'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_controller/metal/rendering.rb:10:in
>  
> `process_action'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/abstract_controller/callbacks.rb:20:in
>  
> `block in process_action'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:117:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:117:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:555:in
>  
> `block (2 levels) in compile'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:505:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:505:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:498:in
>  
> `block (2 levels) in around'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:298:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:298:in
>  
> `block in halting_and_conditional'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:497:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:497:in
>  
> `block in around'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:505:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:505:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:498:in
>  
> `block (2 levels) in around'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:313:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:313:in
>  
> `block (2 levels) in halting'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/rails-observers-0.1.2/lib/rails/observers/action_controller/caching/sweeping.rb:73:in
>  
> `around'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:455:in
>  
> `public_send'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:455:in
>  
> `block in make_lambda'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:312:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:312:in
>  
> `block in halting'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:497:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:497:in
>  
> `block in around'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:505:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:505:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:498:in
>  
> `block (2 levels) in around'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:313:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:313:in
>  
> `block (2 levels) in halting'
>  | /usr/share/foreman/app/controllers/concerns/application_shared.rb:14:in 
> `set_timezone'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:432:in
>  
> `block in make_lambda'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:312:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:312:in
>  
> `block in halting'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:497:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:497:in
>  
> `block in around'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:505:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:505:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:498:in
>  
> `block (2 levels) in around'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:313:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:313:in
>  
> `block (2 levels) in halting'
>  | /usr/share/foreman/app/models/concerns/foreman/thread_session.rb:32:in 
> `clear_thread'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:432:in
>  
> `block in make_lambda'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:312:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:312:in
>  
> `block in halting'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:497:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:497:in
>  
> `block in around'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:505:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:505:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:498:in
>  
> `block (2 levels) in around'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:313:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:313:in
>  
> `block (2 levels) in halting'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/rails-observers-0.1.2/lib/rails/observers/action_controller/caching/sweeping.rb:73:in
>  
> `around'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:455:in
>  
> `public_send'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:455:in
>  
> `block in make_lambda'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:312:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:312:in
>  
> `block in halting'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:497:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:497:in
>  
> `block in around'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:505:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:505:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:92:in
>  
> `__run_callbacks__'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:778:in
>  
> `_run_process_action_callbacks'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:81:in
>  
> `run_callbacks'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/abstract_controller/callbacks.rb:19:in
>  
> `process_action'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_controller/metal/rescue.rb:29:in
>  
> `process_action'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_controller/metal/instrumentation.rb:32:in
>  
> `block in process_action'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/notifications.rb:164:in
>  
> `block in instrument'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/notifications/instrumenter.rb:20:in
>  
> `instrument'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/notifications.rb:164:in
>  
> `instrument'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_controller/metal/instrumentation.rb:30:in
>  
> `process_action'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_controller/metal/params_wrapper.rb:250:in
>  
> `process_action'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activerecord-4.2.5.1/lib/active_record/railties/controller_runtime.rb:18:in
>  
> `process_action'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/abstract_controller/base.rb:137:in
>  
> `process'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionview-4.2.5.1/lib/action_view/rendering.rb:30:in
>  
> `process'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_controller/metal.rb:196:in
>  
> `dispatch'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_controller/metal/rack_delegation.rb:13:in
>  
> `dispatch'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_controller/metal.rb:237:in
>  
> `block in action'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/routing/route_set.rb:74:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/routing/route_set.rb:74:in
>  
> `dispatch'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/routing/route_set.rb:43:in
>  
> `serve'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/journey/router.rb:43:in
>  
> `block in serve'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/journey/router.rb:30:in
>  
> `each'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/journey/router.rb:30:in
>  
> `serve'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/routing/route_set.rb:815:in
>  
> `call'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/apipie-rails-0.3.7/lib/apipie/static_dispatcher.rb:65:in
>  
> `call'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/apipie-rails-0.3.7/lib/apipie/extractor/recorder.rb:132:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/middleware/static.rb:116:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/middleware/static.rb:116:in
>  
> `call'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/apipie-rails-0.3.7/lib/apipie/middleware/checksum_in_headers.rb:27:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/rack-1.6.2/lib/rack/etag.rb:24:in 
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/rack-1.6.2/lib/rack/conditionalget.rb:38:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/rack-1.6.2/lib/rack/head.rb:13:in 
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/middleware/params_parser.rb:27:in
>  
> `call'
>  | /usr/share/foreman/lib/middleware/catch_json_parse_errors.rb:8:in `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/middleware/flash.rb:260:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/rack-1.6.2/lib/rack/session/abstract/id.rb:225:in
>  
> `context'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/rack-1.6.2/lib/rack/session/abstract/id.rb:220:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/middleware/cookies.rb:560:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activerecord-4.2.5.1/lib/active_record/query_cache.rb:36:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:653:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/middleware/callbacks.rb:29:in
>  
> `block in call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:88:in
>  
> `__run_callbacks__'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:778:in
>  
> `_run_call_callbacks'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/callbacks.rb:81:in
>  
> `run_callbacks'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/middleware/callbacks.rb:27:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/middleware/remote_ip.rb:78:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/middleware/debug_exceptions.rb:17:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/middleware/show_exceptions.rb:30:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/railties-4.2.5.1/lib/rails/rack/logger.rb:38:in
>  
> `call_app'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/railties-4.2.5.1/lib/rails/rack/logger.rb:22:in
>  
> `call'
>  | /usr/share/foreman/lib/middleware/tagged_logging.rb:18:in `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/middleware/request_id.rb:21:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/rack-1.6.2/lib/rack/methodoverride.rb:22:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/rack-1.6.2/lib/rack/runtime.rb:18:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/activesupport-4.2.5.1/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/actionpack-4.2.5.1/lib/action_dispatch/middleware/static.rb:116:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/rack-1.6.2/lib/rack/sendfile.rb:113:in
>  
> `call'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/secure_headers-3.4.1/lib/secure_headers/middleware.rb:12:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/railties-4.2.5.1/lib/rails/engine.rb:518:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/railties-4.2.5.1/lib/rails/application.rb:165:in
>  
> `call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/railties-4.2.5.1/lib/rails/railtie.rb:194:in
>  
> `public_send'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/railties-4.2.5.1/lib/rails/railtie.rb:194:in
>  
> `method_missing'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/rack-1.6.2/lib/rack/urlmap.rb:66:in
>  
> `block in call'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/rack-1.6.2/lib/rack/urlmap.rb:50:in
>  
> `each'
>  | 
> /opt/rh/sclo-ror42/root/usr/share/gems/gems/rack-1.6.2/lib/rack/urlmap.rb:50:in
>  
> `call'
>  | 
> /usr/share/passenger/phusion_passenger/rack/thread_handler_extension.rb:74:in 
> `process_request'
>  | 
> /usr/share/passenger/phusion_passenger/request_handler/thread_handler.rb:141:in
>  
> `accept_and_process_next_request'
>  | 
> /usr/share/passenger/phusion_passenger/request_handler/thread_handler.rb:109:in
>  
> `main_loop'
>  | /usr/share/passenger/phusion_passenger/request_handler.rb:455:in `block 
> (3 levels) in start_threads'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/logging-1.8.2/lib/logging/diagnostic_context.rb:323:in
>  
> `call'
>  | 
> /opt/theforeman/tfm/root/usr/share/gems/gems/logging-1.8.2/lib/logging/diagnostic_context.rb:323:in
>  
> `block in create_with_logging_context'
> 2017-06-04 20:22:34 bdcaf224 [app] [I]   Rendered common/500.html.erb 
> within layouts/application (13.0ms)
> 2017-06-04 20:22:34 bdcaf224 [app] [I]   Rendered 
> layouts/_application_content.html.erb (0.7ms)
> 2017-06-04 20:22:34 bdcaf224 [app] [I]   Rendered layouts/base.html.erb 
> (4.5ms)
> 2017-06-04 20:22:34 bdcaf224 [app] [I] Completed 500 Internal Server Error 
> in 270ms (Views: 21.9ms | ActiveRecord: 21.2ms)
>
> Please advise.
> Thanks!
> Ido
>

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