Devise gem error with jruby 1.9

I’ve device_ldap_authenticable installed, when I run rails s I have
this kind of error:

ArgumentError: syntax error in “”, line 10, column 12:
devise:
^
parse at org/jruby/ext/psych/PsychParser.java:273
parse_stream at /home/mauro/jruby/lib/ruby/1.9/psych.rb:148
parse at /home/mauro/jruby/lib/ruby/1.9/psych.rb:119
load at /home/mauro/jruby/lib/ruby/1.9/psych.rb:106
load_file at /home/mauro/jruby/lib/ruby/1.9/psych.rb:205
load_yml at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/i18n-0.6.0/lib/i18n/backend/base.rb:171
send at org/jruby/RubyBasicObject.java:1691
send at org/jruby/RubyKernel.java:2117
load_file at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/i18n-0.6.0/lib/i18n/backend/base.rb:157
load_translations at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/i18n-0.6.0/lib/i18n/backend/base.rb:15
each at org/jruby/RubyArray.java:1603
load_translations at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/i18n-0.6.0/lib/i18n/backend/base.rb:15
init_translations at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/i18n-0.6.0/lib/i18n/backend/simple.rb:57
lookup at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/i18n-0.6.0/lib/i18n/backend/simple.rb:71
translate at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/i18n-0.6.0/lib/i18n/backend/base.rb:26
translate at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/i18n-0.6.0/lib/i18n.rb:156
catch at org/jruby/RubyKernel.java:1205
translate at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/i18n-0.6.0/lib/i18n.rb:152
Railtie at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/activerecord-3.1.0/lib/active_record/railtie.rb:102
call at org/jruby/RubyProc.java:262
execute_hook at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/lazy_load_hooks.rb:34
run_load_hooks at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/lazy_load_hooks.rb:43
each at org/jruby/RubyArray.java:1603
run_load_hooks at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/lazy_load_hooks.rb:42
Finisher at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/railties-3.1.0/lib/rails/application/finisher.rb:56
instance_exec at org/jruby/RubyBasicObject.java:1744
run at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/railties-3.1.0/lib/rails/initializable.rb:25
run_initializers at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/railties-3.1.0/lib/rails/initializable.rb:50
each at org/jruby/RubyArray.java:1603
run_initializers at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/railties-3.1.0/lib/rails/initializable.rb:49
initialize! at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/railties-3.1.0/lib/rails/application.rb
send at org/jruby/RubyBasicObject.java:1685
send at org/jruby/RubyKernel.java:2113
method_missing at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/railties-3.1.0/lib/rails/railtie/configurable.rb:30
(root) at
/home/mauro/projects/EclipseProjects/attivitaproduttive/config/environment.rb:5
require at org/jruby/RubyKernel.java:1047
require at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:240
load_dependency at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:223
new_constants_in at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:640
new_constants_in at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:639
load_dependency at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:223
require at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:240
parse_file at
/home/mauro/projects/EclipseProjects/attivitaproduttive/config/environment.rb:3
instance_eval at org/jruby/RubyBasicObject.java:1717
initialize at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/rack-1.3.2/lib/rack/builder.rb:51
parse_file at
/home/mauro/projects/EclipseProjects/attivitaproduttive/config.ru:0
eval at org/jruby/RubyKernel.java:1093
parse_file at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/rack-1.3.2/lib/rack/builder.rb:40
app at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/rack-1.3.2/lib/rack/server.rb:200
app at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/railties-3.1.0/lib/rails/commands/server.rb:46
wrapped_app at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/rack-1.3.2/lib/rack/server.rb:301
start at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/rack-1.3.2/lib/rack/server.rb:252
start at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/railties-3.1.0/lib/rails/commands/server.rb:70
(root) at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/railties-3.1.0/lib/rails/commands.rb:54
tap at org/jruby/RubyKernel.java:1803
(root) at
/home/mauro/jruby-1.6.4/lib/ruby/gems/1.8/gems/railties-3.1.0/lib/rails/commands.rb:49
require at org/jruby/RubyKernel.java:1047
(root) at script/rails:6