Probably config object is not finalized.

error occured

C:\vagrant\test>vagrant putty

C:/Users/nazoking/.vagrant.d/gems/gems/vagrant-multi-putty-1.1.0/lib/vagrant-multi-putty/command.rb:67:in `spawn': can't convert Object into String (TypeError)
        from C:/Users/nazoking/.vagrant.d/gems/gems/vagrant-multi-putty-1.1.0/lib/vagrant-multi-putty/command.rb:67:in `putty_connect'

log is
  Putty cmd line options: ["127.0.0.1", "-l", #<Object:0x2a0af50>, "-P", "2222", "-i", "C:/vagrant/test/#<Object:0x2a0af50>"]


Probably config object is not finalized.