Attempting to use version 4 of the psych gem results in this error due to safe_load dropping the old deprecated method signature.
ArgumentError: wrong number of arguments (given 4, expected 1)
/usr/local/bundle/gems/psych-4.0.4/lib/psych.rb:322:in `safe_load'
/usr/local/bundle/gems/active-fedora-13.3.0/lib/active_fedora/file_configurator.rb:111:in `load_fedora_config'
Attempting to use version 4 of the psych gem results in this error due to safe_load dropping the old deprecated method signature.