why do these errors occur and what can be done to fix them?
System Error Details
Build QA Brio - 5.9.0 QA Falcon Brio (Start just BRIO) - Build and Deploy 32 : Unknown error occurred on 'Agent 6' when building BRIOQA-QA590BRIOR-BLDDPLY-32. Agent will attempt process the build result...
(java.lang.IllegalStateException : startBuildingOnAgent cannot be called on a terminated build or before 'currently building' has been set. Called for BRIOQA-QA590BRIOR-BLDDPLY-32 on agent 3899394)
Occurred: 31 Aug 2012, 10:04:39 AM
Agent: Agent 6
java.lang.IllegalStateException: startBuildingOnAgent cannot be called on a terminated build or before 'currently building' has been set. Called for BRIOQA-QA590BRIOR-BLDDPLY-32 on agent 3899394
at com.atlassian.bamboo.build.CurrentlyBuildingContainer.startBuildingOnAgent(CurrentlyBuildingContainer.java:107)
at com.atlassian.bamboo.build.DefaultBuildExecutionManager.setBuildRunningOnAgent(DefaultBuildExecutionManager.java:209)
at com.atlassian.bamboo.v2.build.agent.BuildAgentControllerImpl.waitAndPerformBuild(BuildAgentControllerImpl.java:82)
at com.atlassian.bamboo.v2.build.agent.DefaultBuildAgent$1.run(DefaultBuildAgent.java:109)
at com.atlassian.bamboo.build.pipeline.concurrent.NamedThreadFactory$2.run(NamedThreadFactory.java:50)
at java.lang.Thread.run(Thread.java:662)