Merge branch 'hotfix/update_gem_0.2.19'

* hotfix/update_gem_0.2.19:
  gem updated
Merge branch 'release/0.4.4'

* release/0.4.4:
Merge branch 'release/0.4.5'

* release/0.4.5:
  add error to 404
  add log when error
update gem
Merge branch 'hotfix/update_gem_to_0.2.20' into develop

* hotfix/update_gem_to_0.2.20:
  update gem