smoketest displaying error running example

Currently, I get this failure trying to run the example:

java.lang.NoSuchMethodError: com.twitter.concurrent.Spool$.syntax(Lcom/twitter/util/Future;)Lcom/twitter/concurrent/Spool$Syntax;
	at com.twitter.finagle.memcached.CachePoolCluster$class.com$twitter$finagle$memcached$CachePoolCluster$$appendUpdate(CachePoolCluster.scala:146)
	at com.twitter.finagle.memcached.CachePoolCluster$$anonfun$updatePool$2.apply(CachePoolCluster.scala:140)
	at com.twitter.finagle.memcached.CachePoolCluster$$anonfun$updatePool$2.apply(CachePoolCluster.scala:138)
	at scala.collection.immutable.Set$Set1.foreach(Set.scala:86)
	at com.twitter.finagle.memcached.CachePoolCluster$class.updatePool(CachePoolCluster.scala:138)
	at com.twitter.finagle.memcached.StaticCachePoolCluster.updatePool(CachePoolCluster.scala:174)
	at com.twitter.finagle.memcached.StaticCachePoolCluster.<init>(CachePoolCluster.scala:176)
	at com.twitter.finagle.memcached.CachePoolCluster$.newStaticCluster(CachePoolCluster.scala:73)
	at com.twitter.finagle.memcached.KetamaClientBuilder.nodes(Client.scala:764)
	at com.twitter.finagle.memcached.KetamaClientBuilder.nodes(Client.scala:770)
	at com.twitter.summingbird.example.Memcache$.client(Storage.scala:53)