You may be able to export PDF reports by commenting line 51 of
[dradis directory]/lib/vendor/ruby/2.1.0/bundler/gems/dradis-pdf_export-5xxxx/lib/dradis/plugins/pdf_export/exporter.rb
However, I’m still not able to get HTML and CSV export working. If I use github version, I run into theme errors for which I’ve posted a question at SnowCrash theme FATAL error