Here is :
There was an error trying to create an image for disk in vcenter template. Reason: undefined method _ref' for nil:NilClass ["/usr/lib/one/ruby/vcenter_driver/virtual_machine.rb:240:in
block in import_vcenter_disks’", “/usr/lib/one/ruby/vcenter_driver/virtual_machine.rb:239:in each'", "/usr/lib/one/ruby/vcenter_driver/virtual_machine.rb:239:in
import_vcenter_disks’”, “/usr/lib/one/sunstone/routes/vcenter.rb:338:in block in '", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1611:in
call’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1611:in block in compile!'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:975:in
[]’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:975:in block (3 levels) in route!'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:994:in
route_eval’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:975:in block (2 levels) in route!'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1015:in
block in process_route’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1013:in catch'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1013:in
process_route’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:973:in block in route!'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:972:in
each’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:972:in route!'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1085:in
block in dispatch!’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1067:in block in invoke'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1067:in
catch’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1067:in invoke'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1082:in
dispatch!’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:907:in block in call!'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1067:in
block in invoke’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1067:in catch'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1067:in
invoke’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:907:in call!'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:895:in
call’”, “/usr/local/share/gems/gems/rack-1.6.4/lib/rack/commonlogger.rb:33:in call'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:219:in
call’”, “/usr/local/share/gems/gems/rack-1.6.4/lib/rack/deflater.rb:35:in call'", "/usr/local/share/gems/gems/rack-1.6.4/lib/rack/session/abstract/id.rb:225:in
context’”, “/usr/local/share/gems/gems/rack-1.6.4/lib/rack/session/abstract/id.rb:220:in call'", "/usr/local/share/gems/gems/rack-protection-1.5.3/lib/rack/protection/xss_header.rb:18:in
call’”, “/usr/local/share/gems/gems/rack-protection-1.5.3/lib/rack/protection/path_traversal.rb:16:in call'", "/usr/local/share/gems/gems/rack-protection-1.5.3/lib/rack/protection/json_csrf.rb:18:in
call’”, “/usr/local/share/gems/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in call'", "/usr/local/share/gems/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in
call’”, “/usr/local/share/gems/gems/rack-protection-1.5.3/lib/rack/protection/frame_options.rb:31:in call'", "/usr/local/share/gems/gems/rack-1.6.4/lib/rack/nulllogger.rb:9:in
call’”, “/usr/local/share/gems/gems/rack-1.6.4/lib/rack/head.rb:13:in call'", "/usr/local/share/gems/gems/rack-1.6.4/lib/rack/methodoverride.rb:22:in
call’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:182:in call'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:2013:in
call’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1487:in block in call'", "/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1787:in
synchronize’”, “/usr/local/share/gems/gems/sinatra-1.4.7/lib/sinatra/base.rb:1487:in call'", "/usr/local/share/gems/gems/passenger-5.1.8/src/ruby_supportlib/phusion_passenger/rack/thread_handler_extension.rb:97:in
process_request’”, “/usr/local/share/gems/gems/passenger-5.1.8/src/ruby_supportlib/phusion_passenger/request_handler/thread_handler.rb:152:in accept_and_process_next_request'", "/usr/local/share/gems/gems/passenger-5.1.8/src/ruby_supportlib/phusion_passenger/request_handler/thread_handler.rb:113:in
main_loop’”, “/usr/local/share/gems/gems/passenger-5.1.8/src/ruby_supportlib/phusion_passenger/request_handler.rb:416:in block (3 levels) in start_threads'", "/usr/local/share/gems/gems/passenger-5.1.8/src/ruby_supportlib/phusion_passenger/utils.rb:113:in
block in create_thread_and_abort_on_exception’”]
Thanks !