Error: "found character that cannot start any token while scanning"

Issue

• The following error was found on Satellite 6

foreman-rake katello:reindex --trace
** Invoke katello:reindex (first_time)
** Invoke environment (first_time)
** Execute environment
API controllers newer than Apipie cache! Run apipie:cache rake task to regenerate cache.
rake aborted!
undefined method `each' for nil:NilClass

• Then after running the following trace, the next error was observed.

# foreman-rake apipie:cache --trace
** Invoke apipie:cache (first_time)
** Invoke environment (first_time)
** Execute environment
rake aborted!
(/usr/share/foreman/config/initializers/../email.yaml): found character that cannot start any token while scanning for the next token at line 6 column 3
/opt/rh/ruby193/root/usr/share/ruby/psych.rb:203:in `parse'
/opt/rh/ruby193/root/usr/share/ruby/psych.rb:203:in `parse_stream'
/opt/rh/ruby193/root/usr/share/ruby/psych.rb:151:in `parse'
/opt/rh/ruby193/root/usr/share/ruby/psych.rb:127:in `load'
/opt/rh/ruby193/root/usr/share/ruby/psych.rb:297:in `block in load_file'
/opt/rh/ruby193/root/usr/share/ruby/psych.rb:297:in `open'
/opt/rh/ruby193/root/usr/share/ruby/psych.rb:297:in `load_file'
/usr/share/foreman/config/initializers/email.rb:6:in `<top (required)>'
/opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in `load'
/opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in `block in load'
/opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency'
/opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in `load'
/opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/engine.rb:588:in `block (2 levels) in <class:Engine>'
/opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/engine.rb:587:in `each'
/opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/engine.rb:587:in `block in <class:Engine>'
/opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/initializable.rb:30:in `instance_exec'
/opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/initializable.rb:30:in `run'
/opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/initializable.rb:55:in `block in run_initializers'
/opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/initializable.rb:54:in `each'