Add EC2 host in sandbox

Dear comunity,

I try to add i try to add an ec2 host on my OpenNebula 4.12.0 virutal sandbox. Always receive an error message:

>  Error monitoring Host ec2 (4): Error executing poll

/var/log/one/oned.log →

Tue May 12 09:52:23 2015 [Z0][InM][D]: Monitoring datastore default (1)
Tue May 12 09:52:23 2015 [Z0][InM][D]: Monitoring datastore files (2)
Tue May 12 09:52:23 2015 [Z0][InM][D]: Monitoring host ec2 (4)
Tue May 12 09:52:23 2015 [Z0][ImM][D]: Datastore default (1) successfully monitored.
Tue May 12 09:52:23 2015 [Z0][ImM][D]: Datastore files (2) successfully monitored.
Tue May 12 09:52:23 2015 [Z0][InM][I]: Command execution fail: /var/lib/one/remotes/im/run_probes ec2 /var/lib/one//datastores 4124 20 4 ec2
Tue May 12 09:52:23 2015 [Z0][InM][I]: /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in gem_original_require': /usr/lib/ruby/gems/1.8/gems/aws-sdk-resources-2.0.29/lib/aws-sdk-resources.rb:29: syntax error, unexpected ':', expecting ')' (SyntaxError) Tue May 12 09:52:23 2015 [Z0][InM][I]: ...json(definition), source_path: definition) Tue May 12 09:52:23 2015 [Z0][InM][I]: ^ Tue May 12 09:52:23 2015 [Z0][InM][I]: /usr/lib/ruby/gems/1.8/gems/aws-sdk-resources-2.0.29/lib/aws-sdk-resources.rb:44: syntax error, unexpected kEND, expecting $end Tue May 12 09:52:23 2015 [Z0][InM][I]: from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in require’
Tue May 12 09:52:23 2015 [Z0][InM][I]: from /usr/lib/ruby/gems/1.8/gems/aws-sdk-2.0.29/lib/aws-sdk.rb:1
Tue May 12 09:52:23 2015 [Z0][InM][I]: from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in gem_original_require' Tue May 12 09:52:23 2015 [Z0][InM][I]: from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in require’
Tue May 12 09:52:23 2015 [Z0][InM][I]: from ./…/…/vmm/ec2/ec2_driver.rb:34
Tue May 12 09:52:23 2015 [Z0][InM][I]: from ./poll:21:in `require’
Tue May 12 09:52:23 2015 [Z0][InM][I]: from ./poll:21
Tue May 12 09:52:23 2015 [Z0][InM][E]: Error executing poll
Tue May 12 09:52:23 2015 [Z0][InM][I]: ExitCode: 1
Tue May 12 09:52:23 2015 [Z0][ONE][E]: Error monitoring Host ec2 (4): Error executing poll

/etc/one/ec2_driver.conf →

proxy_uri:
regions:
default:
region_name: eu-west-1
access_key_id:AKIAXXXXXXXXXXXXXXXXXXXWA
secret_access_key:EMNXXXXXXXXXXXXXXXXXXXXXXXXXXur00LL
capacity:
m1.small:5
m1.large:0
m1.xlarge:0
us-east-1:

Thanks for assistance