what means 'nsqphp\Exception\PublishException' with message 'Failed to publish message; required 1 for success, achieved 0. Errors were: '

[ErosZy]

Fatal error: Uncaught exception 'nsqphp\Exception\PublishException' with message 'Failed to publish message; required 1 for success, achieved 0. Errors were: ' in /home/zhaoyang/PhizeSocket/application/vendor/socloz/nsqphp/src/nsqphp/nsqphp.php:314

[ErosZy]

error is empty, sometime it occur this error, but the message publish success.