ruby on rails - Paperclip::AdapterRegistry::NoHandlerError when use krajee bootstrap file input -

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i using krajee bootstrap file input uploading multi files in rails. got paperclip::adapterregistry::nohandlererror after click upload button. can me. thanks

class workfile < activerecord::base   has_attached_file :attachment,     :styles => { :small => "150x150#"},     :url => "/assets/work_files/:id/:style/:basename.:extension",     :path => ":rails_root/app/assets/images/work_files/:id/:style/:basename.:extension"     validates_attachment_content_type :attachment, :content_type => ["image/jpg", "image/jpeg", "image/png", "image/gif"]   validates_attachment_size :attachment, :less_than => 1.megabytes end 
class workfilescontroller < applicationcontroller  def upload   @wf = workfile.new   @wf.attachment = params[:pm_file_upload]   @wf.save end  end  started post "/work_files/upload" 192.168.0.5 @ 2016-02-02 21:51:17 +0000 processing workfilescontroller#upload json   parameters: {"pm_file_upload"=>[#<actiondispatch::http::uploadedfile:0x55acb48 @tempfile=#<file:/var/folders/bc/bcjs3dcdgoa9n-zhecdrnu+++ti/-tmp-/rackmultipart20160202-44332-wpd4ik>, @original_filename="hello world.pdf", @content_type="application/pdf", @headers="content-disposition: form-data; name=\"pm_file_upload[]\"; filename=\"hello world.pdf\"\r\ncontent-type: application/pdf\r\n">], "file_id"=>"0"} completed 500 internal server error in 10ms  paperclip::adapterregistry::nohandlererror (no handler found [#<actiondispatch::http::uploadedfile:0x55acb48 @tempfile=#<file:/var/folders/bc/bcjs3dcdgoa9n-zhecdrnu+++ti/-tmp-/rackmultipart20160202-44332-wpd4ik>, @original_filename="hellow world.pdf", @content_type="application/pdf", @headers="content-disposition: form-data; name=\"pm_file_upload[]\"; filename=\"hello world.pdf\"\r\ncontent-type: application/pdf\r\n">]):   app/controllers/work_files_controller.rb:5:in `upload'

change @wf.attachment = params[:pm_file_upload] @wf.attachment = params[:pm_file_upload][0]


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