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java.lang.NullPointerException: 	at java.util.Collections$UnmodifiableCollection.(Unknown Source)	at java.util.Collections$UnmodifiableSet.(Unknown Source)	at java.util.Collections.unmodifiableSet(Unknown Source)	at org.springframework.ide.eclipse.beans.core.internal.model.AbstractBeansConfig.getImports(Unknown Source)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansProject.checkForImportedBeansConfig(Unknown Source)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansProject.getConfigs(Unknown Source)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansProject.getConfig(Unknown Source)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansModel.getConfig(Unknown Source)	at org.springframework.ide.eclipse.beans.core.BeansCoreUtils.isBeansConfig(Unknown Source)	at org.springframework.ide.eclipse.aop.core.util.AopReferenceModelUtils.getAffectedFiles(Unknown Source)	at org.springframework.ide.eclipse.aop.core.builder.AopReferenceModelProjectBuilder.getAffectedResources(Unknown Source)	at org.springframework.ide.eclipse.core.internal.project.SpringProjectContributionManager$ResourceTreeVisitor.visit(Unknown Source)	at org.eclipse.core.internal.resources.Resource$2.visit(Unknown Source)	at org.eclipse.core.internal.resources.Resource$1.visitElement(Unknown Source)	at org.eclipse.core.internal.watson.ElementTreeIterator.doIteration(Unknown Source)	at org.eclipse.core.internal.watson.ElementTreeIterator.doIteration(Unknown Source)	at org.eclipse.core.internal.watson.ElementTreeIterator.doIteration(Unknown Source)	at org.eclipse.core.internal.watson.ElementTreeIterator.doIteration(Unknown Source)	at org.eclipse.core.internal.watson.ElementTreeIterator.iterate(Unknown Source)	at org.eclipse.core.internal.resources.Resource.accept(Unknown Source)	at org.eclipse.core.internal.resources.Resource.accept(Unknown Source)	at org.eclipse.core.internal.resources.Resource.accept(Unknown Source)	at org.springframework.ide.eclipse.core.internal.project.SpringProjectContributionManager.getAffectedResources(Unknown Source)	at org.springframework.ide.eclipse.core.internal.project.SpringProjectContributionManager.build(Unknown Source)	at org.eclipse.core.internal.events.BuildManager$2.run(Unknown Source)	at org.eclipse.core.runtime.SafeRunner.run(Unknown Source)	at org.eclipse.core.internal.events.BuildManager.basicBuild(Unknown Source)	at org.eclipse.core.internal.events.BuildManager.basicBuild(Unknown Source)	at org.eclipse.core.internal.events.BuildManager$1.run(Unknown Source)	at org.eclipse.core.runtime.SafeRunner.run(Unknown Source)	at org.eclipse.core.internal.events.BuildManager.basicBuild(Unknown Source)	at org.eclipse.core.internal.events.BuildManager.build(Unknown Source)	at org.eclipse.core.internal.resources.Project.build(Unknown Source)	at org.springframework.ide.eclipse.core.SpringCoreUtils$1.runInWorkspace(Unknown Source)	at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(Unknown Source)	at org.eclipse.core.internal.jobs.Worker.run(Unknown Source)