Eclipse Luna 4.4.0
Error occurred during the Build
Error instantiating builder \'ord.eclipse.m2e.core.maven
I ran into this same issue and I believe the culprit to be the Sonarqube plugin I had installed.
This discussion pointed me in that direction:
http://forum.spring.io/forum/spring-projects/springsource-tool-suite/749864-sts-ggts-3-6-0-m1-released
Uninstalled the Sonarqube plugin and the error is gone.