Vaadin7:packaging with maven

When packaging with maven this error occure.
[5:06:47 PM]
Charu: [INFO]
Updating theme VAADIN/themes/edulabs
[ERROR]
Exception in thread “main” java.lang.NoClassDefFoundError: com/vaadin/server/themeutils/SASSAddonImportFileCreator
[ERROR]
Caused by: java.lang.ClassNotFoundException: com.vaadin.server.themeutils.SASSAddonImportFileCreator
[ERROR]
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
[ERROR]
at java.security.AccessController.doPrivileged(Native Method)
[ERROR]
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
[ERROR]
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
[ERROR]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
[ERROR]
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
[ERROR]
Could not find the main class: com.vaadin.server.themeutils.SASSAddonImportFileCreator. Program will exit.

Thanks!

Do you have the vaadin theme compiler dependency in your project?