Error running web example

[zr]

When attempting to run the web example, Iago exits with an error after launching the parrot-server and parrot-feeder:

$ java -jar iago-0.6.14.jar -f ../config/web.scala 

...(skipping config and script creation lines)

sh scripts/local-parrot.sh

stdout: /usr/lib/jvm/java-7-openjdk-amd64/bin/java -server -XX:+UseConcMarkSweepGC -verbosegc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -XX:+UseParNewGC -Xloggc:gc-server.log -Xmx4000m -Xms4000m -XX:NewSize=512m com.twitter.parrot.server.ServerMain -f config/target/parrot-server.scala

stdout: /usr/lib/jvm/java-7-openjdk-amd64/bin/java -server -XX:+UseConcMarkSweepGC -verbosegc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -XX:+UseParNewGC -Xloggc:gc-feeder.log -Xmx1744m -Xms1744m -XX:NewSize=512m com.twitter.parrot.feeder.FeederMain -f config/target/parrot-feeder.scala

stderr: Oct 27, 2014 12:00:02 PM com.twitter.finagle.Init$ apply

stderr: INFO: Finagle version 6.11.1 (rev=83de11a66b498351418433bcad00cbf4b7dc495c) built at 20140122-140449

parrot-feeder.log shows an exception:

ERR [20141027-12:00:01.184] feeder: Exception polling parrot[localhost:9999] - com.twitter.finagle.FailedFastException
TRA [20141027-12:00:01.189] util: RemoteParrot: setting rate 1
ERR [20141027-12:00:01.198] admin: Spawned thread background (Thread[background,5,main]) died with a terminal exception
ERR [20141027-12:00:01.198] admin: com.twitter.finagle.FailedFastException
ERR [20141027-12:00:01.198] admin:     at com.twitter.finagle.NoStacktrace(Unknown Source)
ERR [20141027-12:00:02.186] feeder: Exception polling parrot[localhost:9999] - com.twitter.finagle.FailedFastException
ERR [20141027-12:00:03.188] feeder: Exception polling parrot[localhost:9999] - com.twitter.finagle.FailedFastException
ERR [20141027-12:00:04.189] feeder: Exception polling parrot[localhost:9999] - com.twitter.finagle.FailedFastException
INF [20141027-12:00:08.663] twitter: Context: added handler com.twitter.finagle.tracing.TraceContext

ERR [20141027-12:00:10.191] feeder: Exception polling parrot[localhost:9999] - 5.seconds
DEB [20141027-12:00:11.886] feeder: pollParrot: depth is 0.000000 for localhost:9999 ...

Any clues to what the problem might be?