Redmine

Hello,

I am using redmine 3.0. I want to convert my e merged PDFs for all project wiki page. I want to use Docpu plugins. But I get the following error. How can I solve it?
Is there any other plugin or you can suggest?

ActionView::Template::Error (No route matches {:action=>"index", :controller=>"doc_pu", :id=>"test", :project_id=>#<Project id: 6, name: "test", description: "", homepage: "", is_public: false, parent_id: nil, created_on: "2015-05-11 06:56:34", updated_on: "2015-05-11 06:56:34", identifier: "test", status: 1, lft: 7, rgt: 8, inherit_members: false>, :tab=>"modules"}):