Please help, NoMethodError: undefined method `start'

[Iva Dopuđ]

Hi, I'm new at sass, learning...

This is the problem:
sass --watch /home/masquetina/web/style.sass:/home/masquetina/style.css
>>> Sass is watching for changes. Press Ctrl-C to stop

At first looks like it works fine, then after few seconds this:

NoMethodError: undefined method `start' for #<Thread:0x9a7e028>
  Use --trace for backtrace.

After I run this: sass --trace --watch /home/masquetina/web/style.sass:/home/masquetina/style.css

I have this output:

/home/masquetina/.rvm/gems/ruby-2.2.2/gems/sass-3.4.15/lib/sass/plugin/compiler.rb:402:in `block in listen_to': undefined method `start' for #<Thread:0xa07bd04> (NoMethodError)
    from /home/masquetina/.rvm/gems/ruby-2.2.2/gems/sass-3.4.15/lib/sass/plugin/compiler.rb:402:in `map'
    from /home/masquetina/.rvm/gems/ruby-2.2.2/gems/sass-3.4.15/lib/sass/plugin/compiler.rb:402:in `listen_to'
    from /home/masquetina/.rvm/gems/ruby-2.2.2/gems/sass-3.4.15/lib/sass/plugin/compiler.rb:338:in `watch'
    from /home/masquetina/.rvm/gems/ruby-2.2.2/gems/sass-3.4.15/lib/sass/plugin.rb:108:in `method_missing'
    from /home/masquetina/.rvm/gems/ruby-2.2.2/gems/sass-3.4.15/lib/sass/exec/sass_scss.rb:384:in `watch_or_update'
    from /home/masquetina/.rvm/gems/ruby-2.2.2/gems/sass-3.4.15/lib/sass/exec/sass_scss.rb:51:in `process_result'
    from /home/masquetina/.rvm/gems/ruby-2.2.2/gems/sass-3.4.15/lib/sass/exec/base.rb:52:in `parse'
    from /home/masquetina/.rvm/gems/ruby-2.2.2/gems/sass-3.4.15/lib/sass/exec/base.rb:19:in `parse!'
    from /home/masquetina/.rvm/gems/ruby-2.2.2/gems/sass-3.4.15/bin/sass:13:in `<top (required)>'
    from /home/masquetina/.rvm/gems/ruby-2.2.2/bin/sass:23:in `load'
    from /home/masquetina/.rvm/gems/ruby-2.2.2/bin/sass:23:in `<main>'
    from /home/masquetina/.rvm/gems/ruby-2.2.2/bin/ruby_executable_hooks:15:in `eval'
    from /home/masquetina/.rvm/gems/ruby-2.2.2/bin/ruby_executable_hooks:15:in `<main>'

Help me fix it please.
Thanks!

[Natalie Weizenbaum]

This is caused by a new release of the listen gem that we aren't yet compatible with. I should have a new, compatible release out later today, but for now downgrade to listen 2.x as a workaround.

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