I have project running on grails 2.2.1 in IntelliJ IDEA 130.754.
After upgrading of grails version to 2.3.0.M1 grails fails to start
Log from IDEA console
As workaround you can remove all "grails-*-2.3.0.M1-sources.jar" and "grails-*-2.3.0.M1-javadocs.jar" from $GRAILS_HOME/dist
Problem will be fixed in the next EAP.