Can't apply context unless initialized with data supporting contexts

[AlexanderWillner]

Description: Can't apply context unless initialized with data supporting contexts
Version: a6551ec11d7ecff760bc22584e8dac7fe2904c68

Steps that will reproduce the problem?

1. sudo gem install -V dowl
2. dowl path/to/file.ttl

What is the expected result?
New HTML file.

What happens instead?

/Library/Ruby/Gems/2.0.0/gems/rdf-1.1.4.3/lib/rdf/model/graph.rb:126:in `initialize': Can't apply context unless initialized with `data` supporting contexts (ArgumentError)
    from /Library/Ruby/Gems/2.0.0/gems/dowl-0.7/lib/dowl/schema.rb:22:in `new'
    from /Library/Ruby/Gems/2.0.0/gems/dowl-0.7/lib/dowl/schema.rb:22:in `create_from_file'
    from /Library/Ruby/Gems/2.0.0/gems/dowl-0.7/bin/dowl:10:in `<top (required)>'
    from /usr/bin/dowl:23:in `load'
    from /usr/bin/dowl:23:in `<main>'

Possible workaround:
?

Any additional information: