Gem gem install nested_form 报错~~
在安装 rails_admin 时一直报装 nested_form
下面是报错信息，有人碰到过吗~
HEAD http://ruby.taobao.org/latest_specs.4.8.gz 200 OK GET http://ruby.taobao.org/latest_specs.4.8.gz 200 OK Installing gem nested_form-0.3.2 ERROR: While executing gem ... (NoMethodError) undefined method `size' for nil:NilClass
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