Could not find proudhon gem during installation

[edssn]

Hello,
I am trying to install vish on a virtual machine with Ubuntu 14, by following the instructions and I am stuck at the step where gems are installed. I am getting the following error:

Bundler could not find compatible versions for gem "proudhon":
In Gemfile:
social_stream-ostatus was resolved to 2.2.1, which depends on
proudhon (>= 0.3.6)

Could not find gem 'proudhon (>= 0.3.6)', which is required by gem 'social_stream-ostatus', in any of the sources.

Look for the gem in the rubygems directory but it doesn't seem to exist anymore.

[Link]

Also, I commented the proudhon gem line in Gemfile.lock and I tried to install. The installation was successful but when I try to start the Ruby server (rails s), I get the following error with proudhon.

Could not find proudhon-0.3.7 in any of the sources
Run bundle install to install missing gems.

Is there any way to run vish without this library?