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java.lang.NullPointerException: 	at com.twitter.util.Promise.become(Promise.scala:736)	at com.twitter.util.Promise$Transformer.k(Promise.scala:106)	at com.twitter.util.Promise$Transformer.apply(Promise.scala:117)	at com.twitter.util.Promise$Transformer.apply(Promise.scala:98)	at com.twitter.util.Promise$$anon$1.run(Promise.scala:412)	at com.twitter.concurrent.LocalScheduler$Activation.run(Scheduler.scala:201)	at com.twitter.concurrent.LocalScheduler$Activation.submit(Scheduler.scala:159)	at com.twitter.concurrent.LocalScheduler.submit(Scheduler.scala:239)	at com.twitter.concurrent.Scheduler$.submit(Scheduler.scala:107)	at com.twitter.util.Promise.runq(Promise.scala:405)	at com.twitter.util.Promise.updateIfEmpty(Promise.scala:791)	at com.twitter.util.Promise.setDone(Promise.scala:760)	at com.twitter.finagle.http.codec.ConnectionManagerTest.perform(ConnectionManagerTest.scala:113)	at com.twitter.finagle.http.codec.ConnectionManagerTest$$anonfun$8.apply$mcV$sp(ConnectionManagerTest.scala:150)	at com.twitter.finagle.http.codec.ConnectionManagerTest$$anonfun$8.apply(ConnectionManagerTest.scala:150)	at com.twitter.finagle.http.codec.ConnectionManagerTest$$anonfun$8.apply(ConnectionManagerTest.scala:150)