ActiveRecord::RecordNotFound in ThongbaosController#download_file

Couldn't find Thongbao with 'id'=21

Extracted source (around line #9):
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def download_file
@model = Thongbao.find(params[:id])
send_file(@model.file.path,
:filename => File.basename(@model.file_url),
:type => @model.file.content_type,

Rails.root: /app

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Request

Parameters:

{"id"=>"21"}

Response

Headers:

None