在我的应用中，我使用的是spree gem。现在进行产品导入，我使用了spree_import_products gem。
first i add "gem 'import_products', :git => 'git://github.com/joshmcarthur/spree-import-products.git'
然后捆绑安装＆＃34;在gem file.then运行bundle install，它已成功安装。然后运行＆＃34; rake import_products：install＆＃34;。但它显示错误，就像这样....
rake aborted!
NameError: uninitialized constant Spree::ThemeSupport
/home/ec2-user/.rvm/gems/ruby-2.2.1/bundler/gems/spree-import-products-2bcca17f140f/lib/import_products_hooks.rb:1:in `<top (required)>'
/home/ec2-user/.rvm/gems/ruby-2.2.1/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
/home/ec2-user/.rvm/gems/ruby-2.2.1/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
/home/ec2-user/.rvm/gems/ruby-2.2.1/bundler/gems/spree-import-products-2bcca17f140f/lib/import_products.rb:2:in `<top (required)>'
/home/ec2-user/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler/runtime.rb:76:in `require'
/home/ec2-user/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
/home/ec2-user/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler/runtime.rb:72:in `each'
/home/ec2-user/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler/runtime.rb:72:in `block in require'
/home/ec2-user/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in `each'
/home/ec2-user/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in `require'
/home/ec2-user/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler.rb:134:in `require'
如何解决这个问题......