ArtifactDescriptionException: Failed to read artifact descriptor for org.jboss.co (Click for 136 more)
That usually means the dependency is inaccessible due to wrong setup of repositories.
Have you fiddled with the Maven repositories settings in JBDS?
Anyway it would help if you describe what artifact descriptor can't be read. ^ (org.jboss.co... what..)
Had you chance to post this question to JBoss Tools forum?