om_kafka - ERROR Unable to produce message

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I am trying to evaluate om_kafka module on RHEL system.

It starts ok and sends some messages from files to kafka but after a while these messages appear:

2018-03-13 14:52:52 ERROR Unable to produce message 2018-03-13 14:52:55 ERROR last message repeated 183044 times

Sometimes it can be fixed with NXLog service restart, while others not.

nxlog-3.99.3332_RHEL7_x86_64_trial Any suggestion?