Did you verify /Users/sigurthorhalldorsson/.m2/repository/org/springframework/roo/roo-annotations/1.0.0.A2/roo-annotations-1.0.0.A2.jar actually exists on disk?
As per the readme you'll need to manually install the roo-annotations-1.0.0.A2.jar that shipped with Roo. The readme contains the command you need to enter to install it. I see you're on a Mac, so you do it by:
Code:
mvn install:install-file -DgroupId=org.springframework.roo \
-DartifactId=roo-annotations -Dversion=1.0.0.A2 -Dpackaging=jar \
-Dfile=$ROO_HOME/dist/roo-annotations-1.0.0.A2.jar
Hope this helps.