Attempted to beginRule: MultiRule[], does not match outer scope rule: R/

[vogella]

I sometimes see Attempted to beginRule: MultiRule[], does not match outer scope rule: R/ in the log but from the stack trace it is not clear who is doing something wrong here.

java.lang.IllegalArgumentException: Attempted to beginRule: MultiRule[], does not match outer scope rule: R/
	at org.eclipse.core.runtime.Assert.isLegal(Assert.java:68)
	at org.eclipse.core.internal.jobs.ThreadJob.illegalPush(ThreadJob.java:144)
	at org.eclipse.core.internal.jobs.ThreadJob.push(ThreadJob.java:416)
	at org.eclipse.core.internal.jobs.ImplicitJobs.begin(ImplicitJobs.java:67)
	at org.eclipse.core.internal.jobs.JobManager.beginRule(JobManager.java:358)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:291)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:355)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:449)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:452)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:564)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:512)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:594)
	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:208)
	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:309)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

If possible we should add more information here, who is responsible for this.