LoadError on line ["55"] of C: cannot load such file -- wdm

[Frikki]

After installing compass on Windows 7 using

gem install compass -v '0.13.alpha.7'

running

compass watch --trace

produces

LoadError on line ["55"] of C: cannot load such file -- wdm
C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:55:in require' C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/adapter.rb:199:inload_dependent_adapter'
C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/adapters/windows.rb:33:in load_dependent_adapter' C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/adapter.rb:190:inusable?'
C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/adapters/windows.rb:25:in usable?' C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/adapter.rb:182:inusable_and_works?'
C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/adapter.rb:49:in block in select_and_initialize' C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/adapter.rb:47:ineach'
C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/adapter.rb:47:in select_and_initialize' C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/listener.rb:272:ininitialize_adapter'
C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/listener.rb:264:in setup' C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/listener.rb:64:instart!'
C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-0.13.alpha.7/lib/compass/watcher/project_watcher.rb:31:in watch!' C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-0.13.alpha.7/lib/compass/commands/watch_project.rb:48:inperform'
C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-0.13.alpha.7/lib/compass/commands/base.rb:18:in execute' C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-0.13.alpha.7/lib/compass/commands/project_base.rb:19:inexecute'
C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-0.13.alpha.7/lib/compass/exec/sub_command_ui.rb:43:in perform!' C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-0.13.alpha.7/lib/compass/exec/sub_command_ui.rb:15:inrun!'
C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-0.13.alpha.7/bin/compass:30:in block in <top (required)>' C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-0.13.alpha.7/bin/compass:44:incall'
C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-0.13.alpha.7/bin/compass:44:in <top (required)>' C:/Ruby193/bin/compass:23:inload'
C:/Ruby193/bin/compass:23:in `

'

[stevenw00]

Just run gem install wdm

[RaphaelDDL]

Isn't possible to make it a required gem (like sass is) only if you are on Windows (since wdm is win-only)?
Every win computer I install sass/compass gets this error (that would've been avoided some lost minutes/hours depending if I remind of having to install it). But oh well, don't know if is possible to set requirements based on platform.

[srsgores]

#1470

[Snugug]

I've just had a user run into this issue as well with north/generator-style-prototype#46

Having this gem be a dependency on Windows systems would greatly ease Windows onboarding confusion

[scottdavis]

since we are moving away from having our own watcher in the 1.0 land and using sasses it may make sense to test and make sure you don't have issues with this using sass 3.3 watcher

[ameshkin]

I just do'nt understand what's happening. Ive tried things others have said is working for htem. Only on this mac, I just can't get compass working

Here is a stacktrace

LoadError on line ["55"] of /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb: cannot load such file -- rgbapng
/usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in require' /usr/local/lib/ruby/gems/2.4.0/gems/compass-core-1.0.3/lib/compass/configuration/data.rb:179:in require'
/Users/amirm/_sites/compliance.gov/sites/all/themes/officecompliance/config.rb:26:in get_binding' /usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/configuration/serialization.rb:24:in eval'
/usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/configuration/serialization.rb:24:in parse_string' /usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/configuration/serialization.rb:15:in block in _parse'
/usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/configuration/serialization.rb:14:in open' /usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/configuration/serialization.rb:14:in _parse'
/usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/configuration/file_data.rb:7:in block in new_from_file' /usr/local/lib/ruby/gems/2.4.0/gems/compass-core-1.0.3/lib/compass/configuration/inheritance.rb:207:in with_defaults'
/usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/configuration/file_data.rb:6:in new_from_file' /usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/configuration/helpers.rb:19:in configuration_for'
/usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/configuration/helpers.rb:69:in add_project_configuration' /usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/commands/project_base.rb:37:in add_project_configuration'
/usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/commands/project_base.rb:25:in configure!' /usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/commands/project_base.rb:15:in initialize'
/usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/commands/update_project.rb:41:in initialize' /usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/exec/sub_command_ui.rb:42:in new'
/usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/exec/sub_command_ui.rb:42:in perform!' /usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/lib/compass/exec/sub_command_ui.rb:15:in run!'
/usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/bin/compass:30:in block in <top (required)>' /usr/local/lib/ruby/gems/2.4.0/gems/compass-1.0.3/bin/compass:44:in <top (required)>'
/usr/local/bin/compass:22:in load' /usr/local/bin/compass:22:in

'