When you install file column plugin in latest version of rails, you might got this noname or uninitialized error. To fix this error open the plugin/lib/file_colum.rb file goto line number 619 and add ActiveSupport:: before the Inflector. See the final code should be like below at line number 619.
my_options = FileColumn::init_options(options,
ActiveSupport::Inflector.underscore(self.name).to_s,
attr.to_s)
Also at line number 79 find and change as below
url << size="4">Restart the server and see the output.
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