Cannot checkout session because a spawning error occurred.

[Richard Crawford]

We decided to scrap our "Quick Start" installation and go with a full Production installation. I followed all the steps on the Production Installation page, but whenever I try to load Canvas, I get the following error:

We're sorry, but something went wrong.

We've been notified about this issue and we'll take a look at it shortly.

When I examine my Apache error log, I see the following:

 

App 2906 stderr:  [passenger_native_support.so] trying to compile for the current user (canvasuser) and Ruby interpreter...

App 2906 stderr:      (set PASSENGER_COMPILE_NATIVE_SUPPORT_BINARY=0 to disable)

App 2906 stderr:      Warning: compilation didn't succeed. To learn why, read this file:

App 2906 stderr:      /tmp/passenger_native_support-1t35orz.log

App 2906 stderr:  [passenger_native_support.so] not downloading because passenger wasn't installed from a release package

App 2906 stderr:  [passenger_native_support.so] will not be used (can't compile or download) 

App 2906 stderr: 

App 2906 stderr:   --> Passenger will still operate normally.

App 2906 stderr: DEPRECATION WARNING: Syck is deprecated and support for serialization has been removed. ActiveRecord::Core#yaml_initialize will be removed in 4.1 which will break deserialization support with Syck. (called from require at /var/lib/gems/2.1.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:77)

App 2906 stdout: 

[ 2016-03-04 11:02:19.2325 2732/7fb2ec23a700 age/Cor/App/Implementation.cpp:304 ]: Could not spawn process for application /var/canvas: An error occurred while starting up the preloader.

  Error ID: 4536428f

  Error details saved to: /tmp/passenger-error-oqZ8uF.html

  Message from application: syntax error on line 30, col 13: `  cache_store: redis_store' (ArgumentError)

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/syck-1.0.4/lib/syck.rb:188:in `load'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/syck-1.0.4/lib/syck.rb:188:in `parse'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/safe_yaml-1.0.4/lib/safe_yaml/load.rb:173:in `load'

  /var/canvas/config/application.rb:146:in `load'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/safe_yaml-1.0.4/lib/safe_yaml.rb:29:in `safe_load'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/safe_yaml-1.0.4/lib/safe_yaml.rb:12:in `load_with_options'

  /var/canvas/lib/config_file.rb:45:in `load'

  /var/canvas/lib/canvas.rb:53:in `cache_stores'

  /var/canvas/config/environments/cache_store.rb:11:in `block in <top (required)>'

  /var/canvas/config/environments/production.rb:18:in `eval'

  /var/canvas/config/environments/production.rb:18:in `block in <top (required)>'

  /var/canvas/config/environment.rb:3:in `block in environment_configuration'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/railties-4.0.13/lib/rails/railtie/configurable.rb:24:in `class_eval'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/railties-4.0.13/lib/rails/railtie/configurable.rb:24:in `configure'

  /var/canvas/config/environment.rb:2:in `environment_configuration'

  /var/canvas/config/environments/production.rb:1:in `<top (required)>'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.13/lib/active_support/dependencies.rb:229:in `require'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.13/lib/active_support/dependencies.rb:229:in `block in require'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.13/lib/active_support/dependencies.rb:214:in `load_dependency'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.13/lib/active_support/dependencies.rb:229:in `require'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/railties-4.0.13/lib/rails/engine.rb:591:in `block (2 levels) in <class:Engine>'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/railties-4.0.13/lib/rails/engine.rb:590:in `each'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/railties-4.0.13/lib/rails/engine.rb:590:in `block in <class:Engine>'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/railties-4.0.13/lib/rails/initializable.rb:30:in `instance_exec'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/railties-4.0.13/lib/rails/initializable.rb:30:in `run'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/railties-4.0.13/lib/rails/initializable.rb:55:in `block in run_initializers'

  /usr/lib/ruby/2.1.0/tsort.rb:226:in `block in tsort_each'

  /usr/lib/ruby/2.1.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'

  /usr/lib/ruby/2.1.0/tsort.rb:418:in `block (2 levels) in each_strongly_connected_component_from'

  /usr/lib/ruby/2.1.0/tsort.rb:427:in `each_strongly_connected_component_from'

  /usr/lib/ruby/2.1.0/tsort.rb:417:in `block in each_strongly_connected_component_from'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/railties-4.0.13/lib/rails/initializable.rb:44:in `each'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/railties-4.0.13/lib/rails/initializable.rb:44:in `tsort_each_child'

  /usr/lib/ruby/2.1.0/tsort.rb:411:in `call'

  /usr/lib/ruby/2.1.0/tsort.rb:411:in `each_strongly_connected_component_from'

  /usr/lib/ruby/2.1.0/tsort.rb:347:in `block in each_strongly_connected_component'

  /usr/lib/ruby/2.1.0/tsort.rb:345:in `each'

  /usr/lib/ruby/2.1.0/tsort.rb:345:in `call'

  /usr/lib/ruby/2.1.0/tsort.rb:345:in `each_strongly_connected_component'

  /usr/lib/ruby/2.1.0/tsort.rb:224:in `tsort_each'

  /usr/lib/ruby/2.1.0/tsort.rb:205:in `tsort_each'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/railties-4.0.13/lib/rails/initializable.rb:54:in `run_initializers'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/railties-4.0.13/lib/rails/application.rb:215:in `initialize!'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/railties-4.0.13/lib/rails/railtie/configurable.rb:30:in `method_missing'

  /var/canvas/config/environment.rb:11:in `<top (required)>'

  config.ru:3:in `require'

  config.ru:3:in `block in <main>'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/rack-1.5.4/lib/rack/builder.rb:55:in `instance_eval'

  /var/canvas/vendor/bundle/ruby/2.1.0/gems/rack-1.5.4/lib/rack/builder.rb:55:in `initialize'

  config.ru:1:in `new'

  config.ru:1:in `<main>'

  /usr/share/passenger/helper-scripts/rack-preloader.rb:110:in `eval'

  /usr/share/passenger/helper-scripts/rack-preloader.rb:110:in `preload_app'

  /usr/share/passenger/helper-scripts/rack-preloader.rb:156:in `<module:App>'

  /usr/share/passenger/helper-scripts/rack-preloader.rb:30:in `<module:PhusionPassenger>'

  /usr/share/passenger/helper-scripts/rack-preloader.rb:29:in `<main>'

[ 2016-03-04 11:02:19.2424 2732/7fb2ee442700 age/Cor/Con/CheckoutSession.cpp:285 ]: [Client 2-2] Cannot checkout session because a spawning error occurred. The identifier of the error is 4536428f. Please see earlier logs for details about the error.

I'm not even sure where to begin debugging this. Can anyone give me a hand?

[Graham Ballantyne]

You've got a syntax error in your cache_store.yml file:

  Message from application: syntax error on line 30, col 13: `  cache_store: redis_store' (ArgumentError)

 

Double-check that file.

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Graham Ballantyne
IT Services
Simon Fraser University

[Richard Crawford]

Thanks! That resolved one error. Now I'm just getting a blank screen.

[Graham Ballantyne]

Check logs/production.log; it may have a clue. If you want, you can hop into the #canvas-lms IRC channel on freenode and I can help you through it.

---

[Richard Crawford]

Thanks. I think I have it resolved. I re-ran RAILS_ENV=production bundle exec rake db:initial_setup and it seems to be working now.

[Stoo Sepp]

I'm getting a similar error with my production install , saying:

DEPRECATION WARNING: Syck is deprecated and support for serialization has been removed.

Any ideas?

[Graham Ballantyne]

That's just a warning and can be ignored. 

-- 

Graham Ballantyne 

IT Services 

Simon Fraser University