First I thought I might have something to do with JDK version since I had JDK 7, so I also tried a clean install with JDK 1.6.0_37, but same issue in the log:
13:46:48,010 ERROR [org.reflections.Reflections] (MSC service thread 1-1) could not create Vfs.Dir from url. ignoring the exception and continuing: org.reflections.ReflectionsException: could not create Dir using org.jboss.errai.bus.server.service.metadata.VFSUrlType from url vfs:/content/jbpm-gwt-console.war/WEB-INF/classes/
at org.reflections.vfs.Vfs.fromURL(Vfs.java:99) [reflections-0.9.5-RC2_jboss-SP1.jar:]
at org.reflections.vfs.Vfs.fromURL(Vfs.java:89) [reflections-0.9.5-RC2_jboss-SP1.jar:]
at org.reflections.Reflections.scan(Reflections.java:136) [reflections-0.9.5-RC2_jboss-SP1.jar:]
at org.jboss.errai.bus.server.service.metadata.MetaDataScanner.<init>(MetaDataScanner.java:83) [errai-bus-1.1-Final.jar:1.1-Final]
at org.jboss.errai.bus.server.service.metadata.MetaDataScanner.createInstance(MetaDataScanner.java:95) [errai-bus-1.1-Final.jar:1.1-Final]
at org.jboss.errai.bus.server.service.metadata.MetaDataScanner.createInstance(MetaDataScanner.java:87) [errai-bus-1.1-Final.jar:1.1-Final]
at org.jboss.errai.bus.server.service.ErraiServiceConfiguratorImpl.<init>(ErraiServiceConfiguratorImpl.java:58) [errai-bus-1.1-Final.jar:1.1-Final]
at org.jboss.errai.bus.server.service.ErraiServiceConfiguratorImpl$$FastClassByGuice$$b6139751.newInstance(<generated>)
at com.google.inject.internal.cglib.reflect.FastConstructor.newInstance(FastConstructor.java:40) [guice-2.0.jar:]
at com.google.inject.DefaultConstructionProxyFactory$1.newInstance(DefaultConstructionProxyFactory.java:60) [guice-2.0.jar:]
at com.google.inject.ConstructorInjector.construct(ConstructorInjector.java:85) [guice-2.0.jar:]
at com.google.inject.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:111) [guice-2.0.jar:]
at com.google.inject.FactoryProxy.get(FactoryProxy.java:56) [guice-2.0.jar:]
at com.google.inject.SingleParameterInjector.inject(SingleParameterInjector.java:42) [guice-2.0.jar:]