I am learning Grails and just installed STS 2.6. I then installed Grails (current production release) and Groovy Eclipse, but Grails Support will not install. It gives me the following error:

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 2.6.0.201103161000-RELEASE (com.springsource.sts.grails.feature.group 2.6.0.201103161000-RELEASE)
Missing requirement: SpringSource Tool Suite Grails Support (Core) 2.6.0.201103161000-RELEASE (com.springsource.sts.grails.core 2.6.0.201103161000-RELEASE) requires 'bundle org.apache.commons.io 0.0.0' but it could not be found
Cannot satisfy dependency:
From: SpringSource Tool Suite Grails Support 2.6.0.201103161000-RELEASE (com.springsource.sts.grails.feature.group 2.6.0.201103161000-RELEASE)
To: com.springsource.sts.grails.core [2.6.0.201103161000-RELEASE]
Is this file temporarily unavailable or is there something wrong?