unack message

[wjjboy]

I calling python task form java, and the java app need get task result.
but i see each message is unack in rabbitmq. and call about 5times,
rabbitmq will disconnet the java app.
Channel error on connection <0.13121.2> ([::1]:39192 -> [::1]:5672, vhost: '/', user: 'admin'), channel 1: operation none caused a channel exception precondition_failed: delivery acknowledgement on channel 1 timed out. Timeout value used: 1800000 ms. This timeout value can be configured, see consumers doc guide to learn more
how to resolve this? thanks