Skeleton Project Fails to Build

So, in order to solve a problem using Sencha Cmd on Linux with multiple users (build server), now everyone is required to install it in their home directory (much like how Windows users would use the tool).

I created a new directory and decided to run a test ...

cd newdir

sencha -sdk=path/to/extjs/4.2.1 generate app newapp `pwd`

sencha app build production

but I get the classic

[ERR] BUILD FAILED

[ERR] com.sencha.exceptions.ExProcess: compass process exited with non-zero code : 1

as a result. Any clues on what to look at? (I tried ruby versions 1.8.6, 1.9.4, and 2.1.2.)

detailed output:

Sencha Cmd v5.0.0.160

[INF] Processing Build Descriptor : default

[INF] Loading app json manifest...

[INF] Concatenating output to file /homes/bramankp/test/newdir/build/temp/production/GIM/sencha-compiler/cmd-packages.js

[INF] Concatenating output to file /homes/bramankp/test/newdir/build/temp/production/GIM/__core.files

[INF] Concatenating output to file /homes/bramankp/test/newdir/build/temp/production/GIM/__manifest

[INF] Concatenating output to file /homes/bramankp/test/newdir/build/temp/production/GIM/__class.metadata

[INF] Appending concatenated output to file /homes/bramankp/test/newdir/build/temp/production/GIM/__class.metadata

[INF] Appending concatenated output to file /homes/bramankp/test/newdir/build/temp/production/GIM/__class.metadata

[INF] Appending concatenated output to file /homes/bramankp/test/newdir/build/temp/production/GIM/__class.metadata

[INF] Concatenating output to file /homes/bramankp/test/newdir/build/temp/production/GIM/__override.files

[INF] Appending content to /homes/bramankp/test/newdir/bootstrap.js

[INF] Appending content to /homes/bramankp/test/newdir/bootstrap.json

[INF] Compressing data with YuiJavascriptCompressor

[INF] Concatenating output to file /homes/bramankp/test/newdir/build/production/GIM/app.js

[INF] merging resources into /homes/bramankp/test/newdir/build/production/GIM/resources

[INF] merged 0 resources into /homes/bramankp/test/newdir/build/production/GIM/resources

[INF] merging resources into /homes/bramankp/test/newdir/build/production/GIM

[INF] merged 0 resources into /homes/bramankp/test/newdir/build/production/GIM

[INF] writing sass content to /homes/bramankp/test/newdir/build/temp/production/GIM/sass/GIM-all.scss.tmp

[INF] appending sass content to /homes/bramankp/test/newdir/build/temp/production/GIM/sass/GIM-all.scss.tmp

[INF] appending sass content to /homes/bramankp/test/newdir/build/temp/production/GIM/sass/GIM-all.scss.tmp

[INF] executing compass using system installed ruby runtime

[ERR]

[ERR] BUILD FAILED

[ERR] com.sencha.exceptions.ExProcess: compass process exited with non-zero code : 1

[ERR]

[ERR] Total time: 15 seconds

[ERR] The following error occurred while executing this line:

/homes/bramankp/test/newdir/.sencha/app/build-impl.xml:278: The following error occurred while executing this line:

/homes/bramankp/test/newdir/.sencha/app/sass-impl.xml:155: The following error occurred while executing this line:

/homes/bramankp/test/newdir/.sencha/app/sass-impl.xml:168: com.sencha.exceptions.ExProcess: compass process exited with non-zero code : 1

Skeleton Project Fails to Build