Ruby on rails 无法使用smarter_csv运行rake任务

我创建了一个rake任务，用于导入带有smarter\u csvgem的csv

抛出以下消息，如果有帮助，我添加了整个错误代码：

rake import_csv:import_csv
Digest::Digest is deprecated; use Digest
I, [2017-03-01T11:46:08.551994 #7029]  INFO -- : ** [Raven] Raven 0.14.0 configured not to send errors.
rake aborted!
NoMethodError: undefined method `close' for nil:NilClass
/home/my_user/.rvm/gems/ruby-2.1.1@my_app/gems/smarter_csv-1.1.4/lib/smarter_csv/smarter_csv.rb:223:in `ensure in process'
/home/my_user/.rvm/gems/ruby-2.1.1@my_app/gems/smarter_csv-1.1.4/lib/smarter_csv/smarter_csv.rb:223:in `process'
/home/my_user/my_app/lib/tasks/import_csv.rake:7:in `block (2 levels) in <top (required)>'
/home/my_user/.rvm/gems/ruby-2.1.1@my_app/bin/ruby_executable_hooks:15:in `eval'
/home/my_user/.rvm/gems/ruby-2.1.1@my_app/bin/ruby_executable_hooks:15:in `<main>'
Errno::ENOENT: No such file or directory @ rb_sysopen - /csv_imports/pacientes.csv
/home/my_user/.rvm/gems/ruby-2.1.1@my_app/gems/smarter_csv-1.1.4/lib/smarter_csv/smarter_csv.rb:23:in `initialize'
/home/my_user/.rvm/gems/ruby-2.1.1@my_app/gems/smarter_csv-1.1.4/lib/smarter_csv/smarter_csv.rb:23:in `open'
/home/my_user/.rvm/gems/ruby-2.1.1@my_app/gems/smarter_csv-1.1.4/lib/smarter_csv/smarter_csv.rb:23:in `process'
/home/my_user/my_app/lib/tasks/import_csv.rake:7:in `block (2 levels) in <top (required)>'
/home/my_user/.rvm/gems/ruby-2.1.1@my_app/bin/ruby_executable_hooks:15:in `eval'
/home/my_user/.rvm/gems/ruby-2.1.1@my_app/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => import_csv:import_csv
(See full trace by running task with --trace)

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这个问题只用一个点就解决了。路线问题

 ./csv_imports/file.csv

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这是整个堆栈跟踪吗？

 ./csv_imports/file.csv