ActiveRecord::RecordNotFound in LagController#index

Couldn't find Group with 'id'=dimitrov

Extracted source (around line #69):
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@page = page
@right_column = 1
group = Group.find(id)
@description = group.description
@groupname = group.name
norinitialize()

Rails.root: /home/app/webapp

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Request

Parameters:

{"lag"=>"studier",
 "id"=>"dimitrov",
 "format"=>"pdf"}

Response

Headers:

None