Groovy Build Error

[fredcooke]

I had a quick look, but couldn't make sense of this at all. Any clues from anyone?

[ERROR] Failed to execute goal org.codehaus.gmaven:gmaven-plugin:1.3:compile (default) on project riot-redline-plugin: startup failed, /home/fred/repos/java/riot-redline-plugin/src/main/groovy/com/riotgames/maven/redline/RedlineMojo.groovy: -1: The return type of org.redline_rpm.payload.Directive getDirective() in com.riotgames.maven.redline.RedlineMojo$_parseMapping_closure4_closure6 is incompatible with int getDirective() in groovy.lang.Closure.
[ERROR] Node: org.codehaus.groovy.ast.MethodNode. At [-1:-1]  @ line -1, column -1.