Tried installing grails on STS. I get an exception while trying to install Grails Support through extensions:

Problems occurred while performing installation: Operation details
Operation details
Cannot complete the install because one or more required items could not be found.
Software being installed: SpringSource Tool Suite Grails Support 2.8.0.201110171000-RELEASE (com.springsource.sts.grails.feature.group 2.8.0.201110171000-RELEASE)
Missing requirement: SpringSource Tool Suite Groovy Debug Support (Core) 2.8.0.201110171000-RELEASE (com.springsource.sts.groovy.debug.core 2.8.0.201110171000-RELEASE) requires 'bundle org.eclipse.contribution.weaving.jdt 2.2.0' but it could not be found
Cannot satisfy dependency:
From: SpringSource Tool Suite Grails Support 2.8.0.201110171000-RELEASE (com.springsource.sts.grails.feature.group 2.8.0.201110171000-RELEASE)
To: com.springsource.sts.groovy.debug.core [2.8.0.201110171000-RELEASE]

Any pointers would be much appreciated.