Error: can't convert nil into String

[mybuddymichael]

While my coffeescript compiles just fine with the node.js compiler, guard-coffeescript is throwing "ERROR: game.coffee: can't convert nil into String", without a line number or anything debugging info. I have no idea where to start with this one.

[netzpirat]

Since JavaScript/CoffeeScript uses null and not nil like Ruby does, I guess it may be a problem on the Ruby side, for example missing or wrong configuration options or wrong watcher configuration (if any). I tried hard to imagine your configuration files, but was not able to get a clear picture...

[mybuddymichael]

This is my guard.

guard 'coffeescript' do
  watch(%r{^.+\.coffee$})
end

[netzpirat]

The problem was that there is no :input or :output option provided and the watch doesn't contain a match group, which is normally used to support creation of nested output directories.

I changed guard-coffeescript to assume the output is the current working directory when all of the above infos are missing.