Error while trying to run rake task

[luizs81]

ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14] Rails 4.1.11

rake diagram:all --trace
** Invoke diagram:all (first_time)
** Invoke diagram:setup:create_new_doc_folder_if_needed (first_time)
** Execute diagram:setup:create_new_doc_folder_if_needed
** Invoke diagram:models:complete (first_time)
** Execute diagram:models:complete
Generating /Users/luiz/prott-api/doc/models_complete.svg
railroady -lamM | sed -E 's/\x1B\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g' | dot -Tsvg > /Users/luiz/prott-api/doc/models_complete.svg
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/rack-rewrite-1.5.0/lib/rack/rewrite/rule.rb:172: warning: duplicated key at line 173 ignored: "Content-Type"
Error: <stdin>: syntax error in line 1 near 'W'
Warning: syntax ambiguity - badly delimited number '-03T' in line 1 of <stdin> splits into two tokens
Warning: syntax ambiguity - badly delimited number '-03T' in line 2 of <stdin> splits into two tokens
rake aborted!
Command failed with status (1): [railroady -lamM | sed -E 's/\x1B\[([0-9]{1...]
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/file_utils.rb:66:in `block in create_shell_runner'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/file_utils.rb:57:in `call'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/file_utils.rb:57:in `sh'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/file_utils_ext.rb:37:in `sh'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railroady-1.4.2/tasks/railroady.rake:64:in `block (3 levels) in <top (required)>'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/task.rb:240:in `call'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/task.rb:240:in `block in execute'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/task.rb:235:in `each'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/task.rb:235:in `execute'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/task.rb:179:in `block in invoke_with_call_chain'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/task.rb:172:in `invoke_with_call_chain'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/task.rb:201:in `block in invoke_prerequisites'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/task.rb:199:in `each'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/task.rb:199:in `invoke_prerequisites'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/task.rb:178:in `block in invoke_with_call_chain'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/task.rb:172:in `invoke_with_call_chain'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/task.rb:165:in `invoke'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/application.rb:150:in `invoke_task'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/application.rb:106:in `block (2 levels) in top_level'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/application.rb:106:in `each'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/application.rb:106:in `block in top_level'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/application.rb:115:in `run_with_threads'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/application.rb:100:in `top_level'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/application.rb:78:in `block in run'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/application.rb:176:in `standard_exception_handling'
/usr/local/var/rbenv/versions/2.2.2/lib/ruby/2.2.0/rake/application.rb:75:in `run'
/usr/local/var/rbenv/versions/2.2.2/bin/rake:33:in `<main>'
Tasks: TOP => diagram:all => diagram:models:complete