Building app always produces 'compass process exited with non-zero code : 1'

I've been trying to build my application for over a week now to no avail. Today I decided to make a backup of my project and use Sencha Cmd app generate to let the framework regenerate all required application files and then copy my model/view/controllers back into the project and then use 'sencha app build'. This appears to have worked up to the part where it is running compass in the build-step. This will always produce the following output:

Code:

 [ERR] [ERR] BUILD FAILED [ERR] com.sencha.exceptions.ExProcess: compass process exited with non-zero code : 1 [ERR] [ERR] Total time: 8 seconds [ERR] The following error occurred while executing this line: C:\Development\Rest\Dashboard\.sencha\app\build-impl.xml:278: The following error occurred while executing this line: C:\Development\Rest\Dashboard\.sencha\app\sass-impl.xml:155: The following error occurred while executing this line: C:\Development\Rest\Dashboard\.sencha\app\sass-impl.xml:168: com.sencha.exceptions.ExProcess: compass process exited with non-zero code : 1

When I execute with the -debug switch I get a stacktrace but that's pretty much useless as it doesn't detail WHY compass exits with a non-zero error code. I'm using ExtJs 4.2.1 and will soon(in the coming three weeks) be switching over to ExtJs 5. I've tried enabling/disabling extjs4.2 theming but that doesn't work. I have Ruby 1.9.3, JRE 7 update 55 and Sencha Cmd 5.0.0.160. How can I either compell compass to produce a human interpretable error or just fix this?