middleman server error with 'listen' 3.0.3 gem instead of 2.10.1 - bundler

Question

I'm running on windows 8.1 and try to run 'middleman server' (with gem version 2.4.8 and Middleman version 3.3.12). When doing so I get the following error (see below appendix for full error message): " You have already activated listen 3.0.3, but your Gemfile requires listen 2.10.1"
Yet the gem 'Listen' is not explicitely written in my gemfile, must be a dependency with something else.
So what I did was to explicitely add in my gemfile :
gem 'listen', '~> 2.10.1'
And then run again
$bundle install
Yet when I run again '$middleman server' it does not work. So in my terminal I check which version of 'listen' gem I have and see that it's :
C:\Users\Edouard\Desktop\stylus>bundle show listen
C:/Ruby22/lib/ruby/gems/2.2.0/gems/listen-2.10.1
Would someone have a lead on how to solve that ? Because I don't have a clue..
Appendix - The whole error message I get is :
C:\Users\Edouard\Desktop\stylus>middleman server
WARN: Unresolved specs during Gem::Specification.reset:
rack (< 2.0, >= 1.0, >= 1.0.0, >= 1.4.5)
uber (~> 0.0.4)
activesupport (>= 3.1, ~> 4.1)
ffi (>= 0.5.0)
WARN: Clearing out unresolved specs.
Please report a bug if this causes problems.
C:/Ruby22/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:34:in `block in setup': You have already activated listen 3.0.3, but your Gem
file requires listen 2.10.1. Prepending `bundle exec` to your command may solve this. (Gem::LoadError)
from C:/Ruby22/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:19:in `setup'
from C:/Ruby22/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler.rb:127:in `setup'
from C:/Ruby22/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/setup.rb:8:in `<top (required)>'
from C:/Ruby22/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:69:in `require'
from C:/Ruby22/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:69:in `require'
from C:/Ruby22/lib/ruby/gems/2.2.0/gems/middleman-core-3.4.0/lib/middleman-core/load_paths.rb:29:in `setup_load_paths'
from C:/Ruby22/lib/ruby/gems/2.2.0/gems/middleman-core-3.4.0/bin/middleman:10:in `<top (required)>'
from C:/Ruby22/bin/middleman:23:in `load'
from C:/Ruby22/bin/middleman:23:in `<main>'

Answer 1

I had same trouble: middleman server error with 'listen' 3.0.3 gem instead of 2.10.1.
Try remove /Gemfile.lock and exec bundle install.
That worked for me.

Answer 2

The issue is apparently linked to the gem middleman-deploy on windows 8.1.
Here is the solution I apply using github :
remove middleman-deploy from gemfile
in the same folder than the gemfile create a rakefile (without any extension) on which you put require 'middleman gh-pages'
then after you made some changes to your work, do a commit on master branch
then do rake publish