Recovering from consumer failure

I have a consumer program that encountered an error when handling a message
and crashed. It does manual commits, and since it failed, it keeps failing
now because it gets the same bad message. I ran the ExportZkOffsets and
ImportZkOffsets tools successfully to advance the offset before when this
happened, but it is not working this time (the export generates an empty
file).

Going through tools to debug shows the following, what else can I look at?

λ bin/kafka-topics.sh --describe --zookeeper localhost:2181 --topic mytopic
Topic:mytopic PartitionCount:2 ReplicationFactor:1 Configs:
Topic: mytopic Partition: 0 Leader: 0 Replicas: 0
Isr: 0
Topic: mytopic Partition: 1 Leader: 0 Replicas: 0
Isr: 0

λ bin/kafka-topics.sh --describe --zookeeper localhost:2181
--unavailable-partitions
[no results]

λ bin/kafka-run-class.sh kafka.tools.GetOffsetShell --broker-list
localhost:9092 --topic mytopic --time -1
mytopic:0:0
mytopic:1:11

λ bin/kafka-run-class.sh kafka.tools.ConsumerOffsetChecker --topic mytopic
--zkconnect localhost:2181 --group mytopic_group
Group Topic Pid Offset
logSize Lag Owner
Exception in thread "main" org.I0Itec.zkclient.exception.ZkNoNodeException:
org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode =
NoNode for /consumers/mytopic_group/offsets/mytopic/0
at
org.I0Itec.zkclient.exception.ZkException.create(ZkException.java:47)
at
org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:685)
at org.I0Itec.zkclient.ZkClient.readData(ZkClient.java:766)
at org.I0Itec.zkclient.ZkClient.readData(ZkClient.java:761)
at kafka.utils.ZkUtils$.readData(ZkUtils.scala:461)
....

λ bin/kafka-console-consumer.sh --zookeeper localhost:2181 --topic mytopic
--from-beginning
badmessage
{"goodmessage":"details"}