Symfony2 指南针路径模式应用程序错误

我正在尝试在Symfony2上的Assetic中安装Compass，但我似乎遇到了一些问题。 转储资产时，我不断收到此错误：

RuntimeError on line ["62"] of /home/psion/.gem/ruby/gems/compass-connector-0.8.2/lib/           
compass-connector.rb: Path mode app is required for partials/base, vendor detected

我的配置文件对于指南针来说非常简单和基本：

parameters:
# Assetic
 assetic.filter.compass.images_dir: %kernel.root_dir%/../web
 assetic.filter.compass.http_path:ssetic.filter.compass.http_path:  /images
assetic:
debug:          %kernel.debug%
use_controller: false
#java: /usr/bin/java
filters:
    cssrewrite: ~
    #closure:
    #    jar: %kernel.root_dir%/Resources/java/compiler.jar
    #yui_css:
    #    jar: %kernel.root_dir%/Resources/java/yuicompressor-2.4.7.jar
    sass: ~
    compass: ~

知道错误意味着什么或如何解决它吗？