Can't start middleman server.HELP!

#1

hi!

I Installed middlemanapp , and after trying to start a local server asked to install “bundle” .I installed. All was well.

It Gemfile:

source ‘https://rubygems.org’
gem ‘nokogiri’
gem ‘rack’, ‘~> 2.0.1’
gem ‘rspec’

And when i enter “middleman server”

Writes this error:
What shall I do?

Please report a bug if this causes problems.
C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/middleman-cli-4.2.1/bin/middleman:12:in require': cannot load such file -- dotenv (LoadError) from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/middleman-cli-4.2.1/bin/middleman:12:in <top (required)>’
from C:/Ruby24-x64/bin/middleman:23:in load' from C:/Ruby24-x64/bin/middleman:23:in ’

#2

Does your Gemfile include the Middleman gem?

gem 'middleman', '>= 4.0.0

and any additional support, eg

gem 'middleman-livereload'
gem 'middleman-compass', '>= 4.0.0'

If not, try updating your Gemfile and then running bundle install again, then start the server with bundle exec middleman server.

#3

C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/middleman-core-4.2.1/lib/middleman-core/extensions.rb:86:in load': Unknown Extension: autoprefixer. Check the name and make sure you have referenc ed the extension's gem in your Gemfile. (RuntimeError) from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/middleman-core-4.2.1/lib/middleman-core/extension_manager.rb:51:in activate’
from C:/Users/Melnik/WebstormProjects/finish_app/my_project/config.rb:4:in evaluate_configuration!' from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/middleman-core-4.2.1/lib/middleman-core/application.rb:329:in instance_eval’
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/middleman-core-4.2.1/lib/middleman-core/application.rb:329:in evaluate_configuration!' from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/middleman-core-4.2.1/lib/middleman-core/application.rb:286:in initialize’
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/middleman-cli-4.2.1/bin/middleman:49:in new' from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/middleman-cli-4.2.1/bin/middleman:49:in <top (required)>’
from C:/Ruby24-x64/bin/middleman:23:in load' from C:/Ruby24-x64/bin/middleman:23:in ’

#4

Add gem 'middleman-autoprefixer' to your Gemfile, run bundle install again, it should work.