NullPointerException when collecting buildable files

I get this error when submit a dependency build with buildable set.
Can anybody help me to solve it?

Caused by: java.lang.IllegalArgumentException: invalid UUID []
at com.ibm.team.repository.common.UUID.valueOf(UUID.java:76)
at com.ibm.team.enterprise.internal.build.preprocess.service.BuildableFilesGenerator.getResourceName(BuildableFilesGenerator.java:1081)
at com.ibm.team.enterprise.internal.build.preprocess.service.BuildableFilesGenerator.processFilesFromBuildableSubset(BuildableFilesGenerator.java:853)
at com.ibm.team.enterprise.internal.build.preprocess.service.BuildableFilesGenerator.populateBuildableFilesWithBuildableSubset(BuildableFilesGenerator.java:770)
at com.ibm.team.enterprise.internal.build.preprocess.service.BuildableFilesGenerator.populateBuildableFiles(BuildableFilesGenerator.java:710)
at com.ibm.team.enterprise.internal.build.preprocess.service.BuildableFilesGenerator.generateCmds(BuildableFilesGenerator.java:310)
at com.ibm.team.enterprise.internal.build.preprocess.service.AntDependencyPreBuildAgentParticipant.generateCmds(AntDependencyPreBuildAgentParticipant.java:156)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:370)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:356)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56)
at $Proxy5123.generateCmds(Unknown Source)
at com.ibm.rational.buildforge.buildagent.internal.service.BuildAgentRequestService$3.run(BuildAgentRequestService.java:897)
at com.ibm.team.repository.service.internal.permission.ImpersonationService.runAs(ImpersonationService.java:75)

I got both of the above issues solved. I found that the data set definition of the zSource Code folders become undefined reference. I have no idea how this happens. But after resetting the dataset definition. Both of the exceptions gone.