More meaningful error would be better:

java.lang.NullPointerException
at org.jboss.arquillian.impl.client.ContainerDeploymentContextHandler.lookup(ContainerDeploymentContextHandler.java:157)
at org.jboss.arquillian.impl.client.ContainerDeploymentContextHandler.createContext(ContainerDeploymentContextHandler.java:137)
at org.jboss.arquillian.impl.client.ContainerDeploymentContextHandler.createBeforeContext(ContainerDeploymentContextHandler.java:115)
at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:87)
at org.jboss.arquillian.impl.TestContextHandler.createTestContext(TestContextHandler.java:82)
at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:87)
at org.jboss.arquillian.impl.TestContextHandler.createClassContext(TestContextHandler.java:68)
at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:87)
at org.jboss.arquillian.impl.TestContextHandler.createSuiteContext(TestContextHandler.java:54)
at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:87)
at org.jboss.arquillian.impl.core.ManagerImpl.fire(ManagerImpl.java:126)
at org.jboss.arquillian.impl.core.ManagerImpl.fire(ManagerImpl.java:106)
at org.jboss.arquillian.impl.EventTestRunnerAdaptor.before(EventTestRunnerAdaptor.java:85)
at org.jboss.arquillian.junit.Arquillian$4.evaluate(Arquillian.java:210)
at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:303)
at org.jboss.arquillian.junit.Arquillian.access$300(Arquillian.java:45)
at org.jboss.arquillian.junit.Arquillian$5.evaluate(Arquillian.java:228)
at org.jboss.arquillian.junit.Arquillian$2.evaluate(Arquillian.java:173)
at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:303)
at org.jboss.arquillian.junit.Arquillian.access$300(Arquillian.java:45)
at org.jboss.arquillian.junit.Arquillian$3.evaluate(Arquillian.java:187)
at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:127)

Caused an ERROR