webapp: cannot load such file -- braintree

 Output of error log below:

   - [rewdevweb1] err: /Stage[main]/Site_webapp/Exec[compile_assets]/returns: change from notrun to 0 failed: /usr/bin/bundle exec rake assets:precompile returned 1 instead of one of [0] at /srv/leap/puppet/modules/site_webapp/manifests/init.pp:63 

-------------------------------------------------------------------

error log: /var/log/leap/rewire/develop/deploy-rewdevweb1-2013-08-30-215642-error.log
comlete log: /var/log/leap/rewire/develop/deploy-rewdevweb1-2013-08-30-215642.log

Tested on Fr 30. Aug 22:02:39 UTC 2013 on "rewdevweb1" with following versions/git commit IDs: 

Provider (/home/testbot/platform-test/rewire/develop/rewire): not under version control

 = leap command v1.2.1 (master 1c889bd37b147527b7ad140bf8f310da7d196537)
commit 1c889bd37b147527b7ad140bf8f310da7d196537
Author: elijah 
Date:   Fri Aug 16 01:38:54 2013 -0700

    only install compatible sahara vagrant plugin version


 = leap platform v0.2.3 (develop 8b7e1d9afda6a0ae2a8ff5548d9c8ab78370693b)
commit 8b7e1d9afda6a0ae2a8ff5548d9c8ab78370693b
Author: varac 
Date:   Fri Aug 30 14:57:21 2013 +0200

    updated submodule couchdb: couchdb: update_user_webapp fails (Bug #3611)

leap-webapp@rewdevweb1:~$ /usr/bin/bundle exec rake assets:precompile
rake aborted!
cannot load such file -- braintree
/srv/leap/webapp/billing/lib/leap_web_billing/engine.rb:6:in `require'
/srv/leap/webapp/billing/lib/leap_web_billing/engine.rb:6:in `'
/srv/leap/webapp/billing/lib/leap_web_billing.rb:1:in `require'
/srv/leap/webapp/billing/lib/leap_web_billing.rb:1:in `'
/srv/leap/webapp/config/application.rb:13:in `'
/srv/leap/webapp/Rakefile:13:in `require'
/srv/leap/webapp/Rakefile:13:in `'
(See full trace by running task with --trace)

(from redmine: created on 2013-08-30, closed on 2013-08-31, duplicates #3638)