Using softlayer_api (3.1.0)

NoMethodError: undefined method capacity_restriction_maximum=' for #<SoftLayer::ProductConfigurationOption:0x0000000325b2c0> /home/rohits/.rvm/gems/ruby-2.2.1@global/gems/softlayer_api-3.1.0/lib/softlayer/ProductItemCategory.rb:40:ininitialize'
/home/rohits/.rvm/gems/ruby-2.2.1@global/gems/softlayer_api-3.1.0/lib/softlayer/ProductItemCategory.rb:114:in new' /home/rohits/.rvm/gems/ruby-2.2.1@global/gems/softlayer_api-3.1.0/lib/softlayer/ProductItemCategory.rb:114:inblock (4 levels) in class:ProductItemCategory'
/home/rohits/.rvm/gems/ruby-2.2.1@global/gems/softlayer_api-3.1.0/lib/softlayer/ProductItemCategory.rb:113:in collect' /home/rohits/.rvm/gems/ruby-2.2.1@global/gems/softlayer_api-3.1.0/lib/softlayer/ProductItemCategory.rb:113:inblock (3 levels) in class:ProductItemCategory'
/home/rohits/.rvm/gems/ruby-2.2.1@global/gems/softlayer_api-3.1.0/lib/softlayer/ProductItemCategory.rb:112:in collect' /home/rohits/.rvm/gems/ruby-2.2.1@global/gems/softlayer_api-3.1.0/lib/softlayer/ProductItemCategory.rb:112:inblock (2 levels) in class:ProductItemCategory'
/home/rohits/.rvm/gems/ruby-2.2.1@global/gems/softlayer_api-3.1.0/lib/softlayer/DynamicAttribute.rb:138:in block in sl_dynamic_attr' /home/rohits/.rvm/gems/ruby-2.2.1@global/gems/softlayer_api-3.1.0/lib/softlayer/ProductItemCategory.rb:138:indefault_option'
./lib/sliwdautomation/esxi.rb:147:in `block in build_config_base'