Could not find or load main class com.liferay.portal.tools.SassToCssBuilder

I'm using Liferay 6.2 CE. When I'm deploying my portlet, this error message is shown.

Buildfile: /home/matej/liferay-plugins-sdk-6.2/portlets/RegistrationForm-portlet/build.xml
war:
     [java] Error: Could not find or load main class com.liferay.portal.tools.SassToCssBuilder

BUILD FAILED
/home/matej/liferay-plugins-sdk-6.2/build-common.xml:2468: The following error occurred while executing this line:
/home/matej/liferay-plugins-sdk-6.2/build-common.xml:2473: The following error occurred while executing this line:
/home/matej/liferay-plugins-sdk-6.2/build-common.xml:322: The following error occurred while executing this line:
/home/matej/liferay-plugins-sdk-6.2/build-common.xml:2104: The following error occurred while executing this line:
/home/matej/liferay-plugins-sdk-6.2/build-common.xml:175: Java returned: 1

Total time: 5 seconds

Yesterday everything worked just fine... I finished my work saved progress and closed eclipse. Today, after opening eclipse with my project this error message is shown. I'm using liferay-plugins-sdk-6.2, so don't know where the problem is. I will appreciate any kind of help.

Solution

Please read here. Same problem.