Does not terminate the execution of the grunt

[candidosales]

Already used the grunt serve in ubuntu and windows and does not perform the task compass: server, always stop at that point:

Running "serve" task

Running "clean:server" (clean) task
Cleaning .tmp...OK

Running "replace:app" (replace) task
Replace app/index.html -> .tmp/index.html

Running "concurrent:server" (concurrent) task

    Running "emberTemplates:dist" (emberTemplates) task
    File ".tmp/scripts/compiled-templates.js" created.

    Done, without errors.

I have also used 'grunt compass: server -v' and stop right away:

Running tasks: compass:server

Running "compass:server" (compass) task
Verifying property compass.server exists in config...OK
File: [no files]
Options: sassDir="app/styles", cssDir=".tmp/styles", generatedImagesDir=".tmp/images/generated", imagesDir="app/images", javascriptsDir="app/scripts", fontsDir="app/styles/fonts", importPath="app/bower_components", httpImagesPath="/images", httpGeneratedImagesPath="/images/generated", httpFontsPath="/styles/fonts", relativeAssets=false, debugInfo
Options: sassDir="app/styles", cssDir=".tmp/styles", imagesDir="app/images", javascriptsDir="app/scripts", fontsDir="app/styles/fonts", importPath="app/bower_components", relativeAssets=false, debugInfo, time

I'm using Compass 1.0.1

Do you have any solution?